Complex sentence: After the end of World War One, Biggles sets up his own charter business and becomes a freelance civil aviator, willing to do jobs anywhere in the world provided the work is above board and pays decently.
Split into simpler sentences: After the end of World War One, Biggles sets up his own charter business. As a freelance civil aviator, he is willing to do jobs anywhere in the world provided the work is above board and pays decently.