Complex sentence: They started jamming together at home, she started to sing while he played guitar, they played an acoustic gig together at the Violet Town Arts Festival in 1996 including a couple of songs written by Ella who was then aged 13.
Split into simpler sentences: They started jamming together at home; she started to sing while he played guitar. They played an acoustic gig together at the Violet Town Arts Festival in 1996 including a couple of songs written by Ella who was then aged 13.