Complex sentence: In 1919 Isaacs sold the lease to Hugo Hirst, head of the General Electric Company Ltd. Hirst, who in 1934 became Baron Hirst of Witton, lived in the house until his death in 1943.
Split into simpler sentences: In 1919 Isaacs sold the lease to Hugo Hirst, founder of the General Electric Company Ltd, who in 1934 became Baron Hirst of Witton. Hirst lived in the house until his death in 1943.