Complex sentence: A year later, a few members of Senshin Buddhist Temple in Los Angeles were putting away a drum after an obon festival and decided to just have a jam session and after several hours of playing, they decided to form a group.
Split into simpler sentences: A year later, a few members of Senshin Buddhist Temple in Los Angeles were putting away a drum after an obon festival and decided to have a jam session. After several hours of playing, they decided to form a group.