Complex sentence: Wimbledon Common, together with Putney Heath and Putney Lower Common, is protected by the Wimbledon and Putney Commons Act of 1871 from being enclosed or built upon.
Split into simpler sentences: Wimbledon Common, Putney Heath, and Putney Lower Common, which together are managed under the name Wimbledon and Putney Commons. The three commons are protected by the Wimbledon and Putney Commons Act of 1871 from being enclosed or built upon.