How to align multirow table content (text) and keep table rows with similar height?

Question

since 2 weeks working with Tex/Latex I am a beginner but meanwhile frustrated with tables that took me hours.
I want to align the elements of this simple table (with multirows) nicely, i.e.:

1) Each line should have a similar height (tried to solve this \parbox but failed : although for the first two rows the height arguments are higher than for the rest, the row height is smaller ??? [see attached picture of output]
2) the multi row cells should have content that is consistently in the middle of the "merged" cells or consistently are aligned on top with the other cells of the same row. 3) All text in table cells should be aligned to the left horizontally and centered vertically (no justification or grouped style)

Help highly appreciated. Thanks very much in advance. Michael

\begin{table} 
\caption{this is one text example \autocite [Vgl.] [695-770] {Reference29}}
\begin{flushleft}
%\begin{tabularx}{\textwidth}{XXX}
%\begin{tabularx}{\textwidth}{P{0.2\linewidth}P{0.4\linewidth}P{0.4 \linewidth}}
\begin{tabularx}{\textwidth}{P{0.2\linewidth}P{0.3\linewidth}X}
    \toprule
  xxxxxxxxxxxx & xxxxxxxxxxx & xxxxxxxxxxx \\
    \cmidrule{1-3}
    \multirow{4}{\linewidth} {this is one text example} & \multirow{2}{\linewidth}  {this is one text example} & {\parbox[t][4.5ex]{\linewidth}{this is one text example}}\\
    \cmidrule{3-3}
    &  & \parbox[t][4.5ex]{\linewidth}{this is one text example}\\
    \cmidrule{2-3}
    & {this is one text example}
    & {\parbox[t][4.5ex]{\linewidth}{}}\\
    \cmidrule{2-3}  
    & {this is one text example}
    & {\parbox[t][4.5ex]{\linewidth}{}}\\
    \cmidrule{2-3}      
    & {this is one text example}
    & {\parbox[t][4.5ex]{\linewidth}{}}\\
    \cmidrule{1-3}
    this is one text example&{}&{\parbox[t][3.5ex]{\textwidth}{}}\\
    \cmidrule{1-3}
    this is one text example&{}&{\parbox[t][3.5ex]{\textwidth}{}}\\ 
    \cmidrule{1-3}
    \multirow{2}{\linewidth} {this is one text example} &{Bthis is one text example}&{\parbox[t][3.5ex]{\textwidth}{}}\\
    \cmidrule{2-3}
    &{this is one text example}&{\parbox[t][3.5ex]{\textwidth}{}}\\
    \bottomrule
 \end{tabularx}
 \label{tab:Bewertungsmodelle}
 \end{flushleft}
 \end{table}

Answer 1

\documentclass{article}
\usepackage{booktabs,array}
\newlength\tabl
\begin{document}
\begin{table} 

\caption{this is one text example }
\tabl=\dimexpr\textwidth-6\tabcolsep\relax
\begin{tabular}{m{0.3\tabl}p{0.35\tabl}p{0.35\tabl}}
    \toprule
  xxxxxxxxxxxx & xxxxxxxxxxx & xxxxxxxxxxx \\
    \cmidrule{1-3}
    this is one text example & 
\multicolumn{2}{@{}c@{}}{\begin{tabular}{p{0.35\tabl}p{0.35\tabl}}
this is one text example &
\multicolumn{1}{@{}c@{}}{\begin{tabular}{p{0.35\tabl}}
this is one text example\\
    \cmidrule{1-1}
    this is one text example
\end{tabular}}\\
    \cmidrule{1-1}
    this is one text example\\
    \cmidrule{1-2}  
    this is one text example
\end{tabular}}\\
    \cmidrule{1-3}      
    this is one text example&&\\
    \cmidrule{1-3}
    this is one text example&&\\
    \cmidrule{1-3}
 this is one text example &
\multicolumn{2}{@{}c@{}}{\begin{tabular}{p{0.35\tabl}p{0.35\tabl}}
Bthis is one text example&\\
    \cmidrule{1-2}
    this is one text example&
\end{tabular}}\\
    \bottomrule
 \end{tabular}
 \label{tab:Bewertungsmodelle}

 \end{table}

\end{document}