Complex sentence: Sanderson drove an expansion of the society's range of interests, including such areas as soil erosion and use of native trees for soil stabilisation; he also took over the president's position in 1933 which he held until his death in 1945 aged 79.
Split into simpler sentences: Sanderson drove an expansion of the society's range of interests into such areas as soil erosion and use of native trees for soil stabilisation. He became the president in 1933 a position which he held until his death in 1945 aged 79.