Complex sentence: In 1871 the District had built a terminus at Mansion House, on 18 November 1876 the Met had opened its terminus at Aldgate and due to conflict between the two companies it took an Act of Parliament before further work was done on the inner circle.
Split into simpler sentences: In 1871 the District had built a terminus at Mansion House, and on 18 November 1876 the Met opened its terminus at Aldgate. Due to conflict between the two companies it took an Act of Parliament before further work was done on the inner circle.