Complex sentence: Holly seems to enjoy the boys'companionship, and shows gratitude towards Rodrick Heffley's unintentional blunders that wound up destroying the undeserving Heather's birthday party, and the movie ends with Holly slipping her hand into Greg's.
Split into simpler sentences: Holly seems to enjoy the boys'companionship, and shows gratitude for Rodrick Heffley's unintentional blunders that wind up destroying the undeserving Heather's birthday party. The movie ends with Holly slipping her hand into Greg's.