Complex sentence: Several cities also have plans to renovate some railroad infrastructure into park land, including Philadelphia, St. Louis and Chicago, where the Bloomingdale Trail, a 2.7 mile-long linear park on former railroad infrastructure, will run through several neighborhoods.
Split into simpler sentences: Several cities also have plans to renovate some railroad infrastructure into park land, including Philadelphia and St. Louis. In Chicago, where the Bloomingdale Trail, a-long linear park on former railroad infrastructure, will run through several neighborhoods.