Complex sentence: The Old Operating Theatre Museum is London's most intriguing historic interior-it is found in the Garret of St Thomas's Church, Southwark, on the original site of St Thomas' Hospital.
Split into simpler sentences: The Old Operating Theatre Museum is one of London's most intriguing historic interiors. It is found in the garret of St Thomas's Church, Southwark, on the original site of St Thomas' Hospital.