Complex sentence: Marlborough Royal Free Grammar School was a grammar school in the town of Marlborough, in Wiltshire, England, founded in 1550 at the Marsh at the Hospital of St John the Baptist.
Split into simpler sentences: Marlborough Royal Free Grammar School was a grammar school in the town of Marlborough, in Wiltshire, England. The School was founded in 1550 as part of the Hospital of St John the Baptist.