Complex sentence: King's College London School of Medicine and Dentistry at Guy's, King's and St Thomas' Hospitals, originally based at King's College Hospital (Denmark Hill, South London), is the largest in the United Kingdom.
Split into simpler sentences: King's College School of Medicine and Dentistry, was King's College Hospital (Denmark Hill, South London). It is now part of the King's College London School of Medicine and Dentistry at Guy's, King's College and St Thomas' Hospitals and is the largest in the United Kingdom.