Complex sentence: Graham Parker's track (No 6 and the final track on side 1 of the LP) was not listed on the original release, probably due to his then current contract with Phonogram, for whose Vertigo label he and the Rumour had already released two LPs.
Split into simpler sentences: Graham Parker's track (No 6 and the final track on side 1 of the LP) was not listed on the original release. Probably due to his then current contract with Phonogram, for whose Vertigo label he and The Rumour had already released two LPs.