Complex sentence: Mayhem games are worth up to 50 points for the team; however, these are sometimes awarded incrementally, such as 10 points for each item found; but mostly only awarded after a complete success.
Split into simpler sentences: Mayhem games are worth up to 50 points for the team. However, these are sometimes awarded incrementally, such as 10 points for each item found; but mostly only awarded after a complete success.