Complex sentence: Tom and Dave have a third guy audition for their grage band, soon the band includes Tom on bass, Dave as the drummer, Orson on the keyboard, Carlos playing the tambourine, and Mike singing and playing guitar.
Split into simpler sentences: Tom and Dave have a third guy audition for their grage band. Soon the band includes Tom on bass, Dave as the drummer, Orson on the keyboard, Carlos playing the tambourine, and Mike singing and playing guitar.