Complex sentence: His grandson Lee Merriam Talbot (born 1930) was a geographer and ecologist who was among the IUCN team which rediscovered the Persian Fallow Deer in 1957, and secretary general of the IUCN from 1980 to 1983.
Split into simpler sentences: His grandson Lee Merriam Talbot (born 1930) was a notable geographer and ecologist. He was among the IUCN team who rediscovered the Persian Fallow Deer in 1957 and he was secretary general of the IUCN from 1980 to 1983.