Complex sentence: At the time of his retirement from Guy's Hospital in 1925, Fripp was a famous personage in London and environs: when he died in 1930, he was a household name throughout the Empire.
Split into simpler sentences: At the time of his retirement from Guy's Hospital in 1925, Fripp was a famous personage in London and environs. When he died in 1930, he was a household name throughout the Empire.