Complex sentence: The mansion also included plumbing and forced hot air central heating and electric lighting which was powered by a hydroelectric plant built on the estate on the Crumb Elbow stream--the Vanderbilt estate had electric lighting before the surrounding area.
Split into simpler sentences: The mansion also included plumbing and forced hot air central heating and electric lighting which was powered by a hydroelectric plant built on the estate on the Crumb Elbow stream. The Vanderbilt estate had electric lighting before the surrounding area.