Complex sentence: He encouraged and arranged for a second performance at his church, Westminster Central Hall, with a revised and expanded format; the boys of Colet Court and members of the band Mixed Bag sang at this performance in May 1968.
Split into simpler sentences: He encouraged and arranged for a second performance at his church, Westminster Central Hall, with a revised and expanded format. The boys of Colet Court and members of the band Mixed Bag sang at this performance in May 1968.