Complex sentence: The Class 322s operate services with Northern and are used to provide services between Leeds and Doncaster as well as the Leeds-Skipton-Bradford-Ilkley "Triangle".
Split into simpler sentences: The Class 322s operate services with Northern and are used to provide additional services between Leeds and Doncaster. The fleet are operating on the Leeds-Doncaster services and the Leeds-Skipton-Bradford-Ilkley "Triangle".