Complex sentence: Williamson was born in Leeds and attended the Leeds School of Art from 1911 to 1914, when he moved to London to study at the Royal Academy schools, where he was awarded the Turner Gold Medal.
Split into simpler sentences: Williamson was born in Leeds and attended the Leeds School of Art from 1911 to 1914, when he moved to London to study at the Royal Academy schools. During the year he was at the Academy school he was awarded the Turner Gold Medal.