Complex sentence: It is a rail care depot used by Northern Rail to service certain rolling stock depending on the severity of service needed and where the service emanates from, heavy engineering works to rolling stock owned by Northern Rail are sent to an alternate depot in Newcastle upon Tyne.
Split into simpler sentences: It is a rail care depot used by Northern Rail to service certain rolling stock. Depending on the severity of service needed and where the service emanates from, heavy engineering works to rolling stock owned by Northern Rail are sent to an alternate depot in Newcastle upon Tyne.