Complex sentence: Through most of his life he maintained a fastidious appearance, a neat moustache which he kept well groomed, his hair was invariably neatly combed, and since his days in Sayville, New York he almost always wore a suit in public.
Split into simpler sentences: Through most of his life he maintained a moustache which he kept well groomed. His hair was invariably combed, and since his days in Sayville, New York he almost always wore a suit in public.