Complex sentence: There was not enough capacity through the tunnel to accommodate all of the services, and so as a solution, Moor Street station was built as an'overflow' at the opposite end of the tunnel to take local trains towards Leamington Spa and Stratford upon Avon.
Split into simpler sentences: There was not enough capacity through the tunnel to accommodate all of the services. As a solution, Moor Street station was built as an'overflow' at the opposite end of the tunnel to take local trains towards Leamington Spa and Stratford upon Avon.