Complex sentence: The Joseph Eastham Steel Band, in addition to performing regularly in school, performed at St. Ann's Hospice and Ellesmere Shopping Centre, and also represented Salford at the Northwest Schools' Prom held at Manchester's Bridgewater Hall in 1999.
Split into simpler sentences: The Joseph Eastham Steel Band, in addition to performing regularly in school, performed at St. Ann's Hospice and Ellesmere Shopping Centre. The Steel Band also represented Salford at the Northwest Schools' Prom held at Manchester's Bridgewater Hall in 1999.