Complex sentence: As part of the London Midland region of BR, It remained a busy line with trains from Liverpool Central and Warrington Central up until the mid- 1960s it was only until the withdrawal of these stopping passenger services in 1964 did all the stations close along the line.
Split into simpler sentences: As part of the London Midland region of BR, It remained a busy line with trains from Liverpool Central and Warrington Central up until the mid- 1960s. It was only on the withdrawal of these stopping passenger services in 1964 that all the stations closed along the line.