Complex sentence: Dumas was born in Mount Barker, South Australia second of five children of Charles M. R. Dumas (1851--1935), who founded the Mount Barker Courier newspaper.
Split into simpler sentences: Dumas was born in Mount Barker, South Australia to a family of five children. His father, Charles M. R. Dumas (1851--1935), was founder of the Mount Barker Courier newspaper.