Complex sentence: Bazin had the advantage of alredy being based at Inchicore which was to be the lead works for the GSR, and the need to balance senior roles between the companies may also have been an influence.
Split into simpler sentences: Bazin had the advantage of already being based at Inchicore which was to be the lead works for the GSR. The need to balance senior roles between the companies may also have been an influence.