Complex sentence: Ringwood Manor was home to a number of well-known ironmasters from the 1740s to the late 19th century; one of its last owners was Abram S. Hewitt, ironmaster, educator, lawyer, U.S. Congressman, and mayor of New York City.
Split into simpler sentences: Ringwood Manor was home to a number of well-known ironmasters from the 1740s to the late 19th century. One of its last owners was Abram S. Hewitt, ironmaster, educator, lawyer, U.S. Congressman, and mayor of New York City.