Complex sentence: The Custis Trail was built alongside Interstate 66 (named the Custis Memorial Parkway in Virginia east of the Capital Beltway) and opened in the early 1980s at the same time that the highway did.
Split into simpler sentences: The Custis Trail was built alongside Interstate 66 (named the Custis Memorial Parkway in Virginia east of the Capital Beltway). The trail opened in the early 1980s at the same time that the highway did.