Complex sentence: Many of the important buildings are centered around Bath Abbey which was founded in the 7 th century, reorganised in the 10 th and rebuilt in the 12 th and 16 th centuries.
Split into simpler sentences: Many of the important buildings are centred around Bath Abbey which was founded in the 7 th century. It was reorganised in the 10 th and rebuilt in the 12 th and 16 th centuries.