Complex sentence: There were also displays of clog dancing and sword dancing by colliery groups and the finale was a perfromance by a 700-strong choir accompanied by a brass band and conducted by Sir Adrian Boult.
Split into simpler sentences: There were also displays of clog dancing and sword dancing by colliery groups. The finale was a performance by a 700-strong choir accompanied by a massed brass band and conducted by Sir Adrian Boult.