When first doing truth tables, it's best to break a sentence into its constituent parts. Here the propositions are $p,q,r$, so have the first three columns of your truth table be possible truth values for these. Then the remaining columns should be things such as $\neg q$, $\neg r$, $\neg q \vee\neg r$, $\neg p\wedge q$, $p\to (\neg q\vee\neg r)$, finally building up to $p\to (\neg q\vee\neg r)\wedge\neg p\wedge q$.
To get started, the possible triples for $(p,q,r)$ are $(T,T,T),(T,T,F),(T,F,T),(F,T,T),(T,F,F),(F,T,F),(F,F,T),(F,F,F)$, and the rest of the table should follow easily from there. and the sentence should be easier to understand in retrospect, now that you see how each part affects each other part.