Complex sentence: Ashton-in-Makerfield railway station was a railway station serving that town, although, technically, it was located in neighbouring Haydock, formerly in the English county of Lancashire (now Merseyside).
Split into simpler sentences: Ashton-in-Makerfield railway station was a railway station serving that town. However, it was located in neighbouring Haydock, formerly in the English county of Lancashire (now Merseyside).