Complex sentence: He is first heard of as Serjeant-at-law (Ireland) in 1460 and was clearly a man of substance, owning the impressive Baldongan Castle, near Skerries, County Dublin, and a nearby estate at Courtlough.
Split into simpler sentences: He is first heard of as Serjeant-at-law (Ireland) in 1460. He was clearly a man of some wealth, owning the impressive Baldongan Castle, near Skerries, County Dublin, and a nearby estate at Courtlough.