Complex sentence: He married, in 1818, Miss Percy of Whitby, with whom he had a large family; his youngest son, Michael Talbot Calvert, made a reputation as a tragic actor, under the stage name of Henry Talbot.
Split into simpler sentences: He married, in 1818, Miss Percy of Whitby, with whom he had a large family. His youngest son, Michael Talbot Calvert, made a reputation as a tragic actor, under the stage name of Henry Talbot.