Complex sentence: She then fails her cheer team tryouts and doesn't make the team even though Stephanie does and when it comes time for her birthday party it seems as if most of her friends end up ditching it in favor of Leo's.
Split into simpler sentences: She then fails her cheer team tryouts and doesn't make the team even though. Lisa does and when it comes time for her birthday party it seems as if most of her friends end up ditching it in favor of Leo's.