Complex sentence: They stayed at Golden Lane for just over a year before transfering to the Wimbledon Theatre, where they stayed for the next three years, it was a bigger theatre than Stratford East and the Golden Lane and yet they still packed it.
Split into simpler sentences: They stayed at Golden Lane for just over a year before transfering to the Wimbledon Theatre, where they stayed for the next three years. It was a bigger theatre than Stratford East and the Golden Lane yet still they packed it.