Complex sentence: Monday to Saturdays there is generally an hourly service southbound towards Cardiff Central and beyond (Milford Haven or Carmarthen) and northbound towards Shrewsbury and Manchester Piccadilly, with a two-hourly service in each direction on Sundays.
Split into simpler sentences: Monday to Saturdays there is generally an hourly service southbound towards Cardiff Central and beyond (Milford Haven or Carmarthen) and northbound towards Shrewsbury and Manchester Piccadilly. With a two-hourly service in each direction on Sundays.