Complex sentence: An ancient parish in the county of Surrey, as part of the suburban growth of London in the 20th century, Sutton significantly expanded and increased in population, becoming a municipal borough with neighbouring Cheam in 1934, and has formed part of Greater London since 1965.
Split into simpler sentences: An ancient parish in the county of Surrey, Sutton significantly expanded and increased in population as part of the suburban growth of London in the 20th century. It became a municipal borough with neighbouring Cheam in 1934, and has formed part of Greater London since 1965.