Complex sentence: His marriage broke up, ending in divorce (1950), and his ex-wife then married the artist Michael Ayrton; he later married Yovanka Tomich, in 1953 and had a further 2 children by her.
Split into simpler sentences: His marriage broke up, ending in divorce (1950), and his former wife then married the artist Michael Ayrton. Balchin later married Yovanka Tomich, in 1953 and had a further 2 children by her.