Complex sentence: With Elton John guest playing on piano on 2 tracks, Byford laid down the bass parts, but soon the band hired Paul Johnson to fill the spot and a European arena tour followed.
Split into simpler sentences: With Elton John guest playing on piano on 2 tracks, and Byford laying down the bass parts, the band soon found themselves on the road. They hired bassist Paul Johnson to fill the spot and a European arena tour followed.