Complex sentence: He rented a double-room apartment in the London district Queen's Gate for 26 years until around 1986 when he moved to Fairwater House in Teddington; while looking for somewhere to live, he lived at 88 Westrow Gardens in Southampton.
Split into simpler sentences: He rented a double-room apartment in the London district Queen's Gate for 26 years until around 1986 when he moved to Fairwater House in Teddington;. While looking for somewhere to live, he stayed at 88 Westrow Gardens in Southampton.