Complex sentence: Sally Illman attended Marlborough College public school, as a contemporary of the British Prime Minister's wife, Samantha Cameron, and went on to attend Keble College, Oxford, dropping out after two years.
Split into simpler sentences: Sally Illman attended Marlborough College public school, as a contemporary of the British Prime Minister's wife, Samantha Cameron. She later went on to attend Keble College, Oxford, dropping out after two years.