Complex sentence: In autumn 2009, new Nova LFS models were purchased to replace the existing iXpress fleet; as these become equipped to service the route, the older 2004-era buses are reverting to regular GRT livery.
Split into simpler sentences: In autumn 2009, new Nova LFS models were purchased to replace the existing iXpress fleet. As these become equipped to service the route, the older 2004-era buses are reverting to regular GRT livery.