Complex sentence: Harry, Ron, and Hermione are rewarded with house points for their heroic performances, tying them for first place with Slytherin, however Neville Longbottom is awarded 10 points for attempting to stop his friends, giving Gryffindor enough points to win the House Cup.
Split into simpler sentences: Harry, Ron, and Hermione are rewarded with house points for their heroic performances, tying them for first place with Slytherin. However, Neville Longbottom is awarded 10 points for attempting to stop his friends, giving Gryffindor enough points to win the House Cup.