Complex sentence: Howard Greenley (1874--1963) was an architect who worked from the late 1800s well into the 20th century and known mainly for his work in New York City, Long Island, and Newport, Rhode Island.
Split into simpler sentences: Howard Greenley (1874--1963) was an architect who worked from the late 1800s well into the 20th century. He is known mainly for his work in New York City, Long Island, and Newport, Rhode Island.