Complex sentence: James Randolph Vigne (1928--19 June 2016) was a South African anti-apartheid activist, an influential member of the Liberal Party of South Africa, founder member of the National Committee for Liberation, founder of the African Resistance Movement (ARM).
Split into simpler sentences: James Randolph Vigne (1928--19 June 2016) was a South African anti-apartheid activist. He was an influential member of the Liberal Party of South Africa, a founding member of the National Committee for Liberation, and the founder of the African Resistance Movement (ARM).