Complex sentence: He married Catherine Olivia King, the daughter of Thomas Charles King, in London on 31 July, 1871, who was known professionally as "Katty King" and was a light comic actress.
Split into simpler sentences: He married Catherine Olivia King, the daughter of Thomas Charles King, in London on 31 July, 1871. Kathleen, who was known professionally as "Katty King" and was a light comic actress.