Complex sentence: As of 1941, the southern terminus was at a major intersection with U.S. Route 22, U.S. Route 309, and PA Route 29 at Tilghman Street in Allentown; although today all of these routes are either decommissioned or at different locations.
Split into simpler sentences: As of 1941, the southern terminus was at a major intersection with U.S. Route 22, U.S. Route 309, and PA Route 29 at Tilghman Street in Allentown. Today, US 22, US 309, and PA 29 are either decommissioned or at different locations.