Complex sentence: The helping out later on leads to a deep kiss with Hotaru who says that Yuma now knows how to kiss a guy, this leaves her thinking though about how much better this one was then the one she had shared with her boyfriend.
Split into simpler sentences: The helping out later on leads to a deep kiss with Hotaru who says that Yuma now knows how to kiss a guy. This leaves her thinking though about how much better this kiss was then the one she had shared with her boyfriend.