Complex sentence: Barton Holland Warnock (1911--1998) was an American botanist and leading authority on flora of the Trans-Pecos area and northern Chihuahua Desert.
Split into simpler sentences: Barton Holland Warnock (1911--1998) was an American botanist. Warnock was an American botanist and leading authority on flora of the Trans-Pecos area and northern Chihuahua Desert.