Complex sentence: He was appointed Bishop of Rochester and Prior of the Cathedral Priory there; built castles, including Rochester, Colchester and the White Tower of the Tower of London and the Priory and Cathedral Church of Rochester.
Split into simpler sentences: He was appointed Bishop of Rochester and Prior of the Cathedral Priory there. He built several castles, including Rochester, Colchester and the White Tower of the Tower of London and the Priory and Cathedral Church of Rochester.