Complex sentence: The Turnpike was originally known as the Sunshine State Parkway from its opening in January 1957 to July 1969, when the Turnpike Authority was absorbed by the new Florida Department of Transportation and the road was renamed Florida's Turnpike.
Split into simpler sentences: The Turnpike was originally known as the Sunshine State Parkway from its opening in January 1957 to July 1969. At that time, the Florida State Turnpike Authority was absorbed by the then new Florida Department of Transportation and the road was renamed Florida's Turnpike.