Complex sentence: Messi started his first game in the next qualifying match against Peru, in which he was able to win a crucial penalty that secured their victory; after the match Pékerman described him as "a jewel".
Split into simpler sentences: Messi started his first game in the next qualifying match against Peru, in which he was able to win a crucial penalty that secured their victory. After the match, Pékerman described him as "a jewel".