Complex sentence: A tunnel was constructed between Edge Hill and the new station (starting in 1832, prior to station construction), and the station was opened to the public in August 1836, although construction was not completed until the following year.
Split into simpler sentences: A tunnel was constructed between Edge Hill and the new station prior to station construction in 1832. The station was opened to the public in August 1836, although construction was not completed until the following year.