Complex sentence: Fayette County was one of the original three counties created from the former Kentucky County, Virginia by the Virginia Act in 1780, along with Jefferson and Lincoln counties, and which together separated from Virginia in 1792 to become the state of Kentucky.
Split into simpler sentences: Fayette County was one of the original three counties created from the former Kentucky County, Virginia by the Virginia Act in 1780, along with Jefferson and Lincoln counties. Together they separated from Virginia in 1792 to become the state of Kentucky.