Complex sentence: On the Hallam Line, Monday to Saturday daytimes there are two trains per hour northbound to Wakefield Kirkgate and Leeds, evenings and Sundays there is generally an hourly service.
Split into simpler sentences: On the Hallam Line during the day on Monday to Saturday, there are two trains per hour northbound to Wakefield Kirkgate and Leeds. During the evening and on Sundays there is generally an hourly service.