Complex sentence: FAULKNER, THOMAS (1777--1855), topographer of Chelsea and other localities about London, belonged to a respectable family, some of whom had made money in the building trade in the west of London.
Split into simpler sentences: FAULKNER, THOMAS (1777--1855), was an English topographer of Chelsea and other localities about London. Faulkner belonged to a respectable family, some of whom had made money in the building trade in the west of London.