Complex sentence: Benn also met former Liberal Prime Minister David Lloyd George when he was twelve and later recalled that, while still a boy, he once shook hands with Mahatma Gandhi; in 1931, while his father was Secretary of State for India.
Split into simpler sentences: Benn also met David Lloyd George when he was 12 and later recalled that, while still a boy, he once shook hands with Mahatma Gandhi. This was in 1931, while his father was Secretary of State for India.