Complex sentence: Fiennes died in 1943 and his title was inherited by his son who died the same year, the explorer Sir Ranulph Fiennes inherited the title on his birth in 1944.
Split into simpler sentences: Fiennes died in 1943 and his title was inherited by his son who died the same year. His grandson, the explorer Sir Ranulph Fiennes, inherited the title on his birth in 1944.