Complex sentence: There is a smaller entrance and ticket office on the up line, providing convenient access to the car park; however, the ticket office is normally unstaffed outside of peak hours and the ticket machines are often out of service.
Split into simpler sentences: There is a smaller entrance and ticket office on the up line, providing convenient access to the car park. However, the ticket office is normally unstaffed outside of peak hours and the ticket machines are often out of service.