Complex sentence: Lionel Duckett (1511--August 1587) was one of the Merchant adventurers of the City of London, he was 4 times Master of the Mercers' Company, and Lord Mayor of London (1572).
Split into simpler sentences: Lionel Duckett (1511August 1587) was one of the Merchant adventurers of the City of London. He was four times Master of the Mercers' Company, and Lord Mayor of London (1572).