Complex sentence: Opened in 1938, its largest lock was 600 feet long and was demolished in 1990 and was replaced by the Melvin Price Locks and Dam, which is also known as Lock and Dam number 26.
Split into simpler sentences: Opened in 1938, its largest lock was 600 feet long. It was demolished in 1990 and replaced by the Melvin Price Locks and Dam, which is also known as Lock and Dam number 26.