Complex sentence: Louis Cennamo then replaced Tony Reeves on bass, but was replaced by Mark Clarke within a month, and Hiseman recruited vocalist Chris Farlowe to enable Clempson to concentrate on guitar.
Split into simpler sentences: Louis Cennamo then briefly replaced Tony Reeves on bass, but was replaced in turn by Mark Clarke within a month. Then Hiseman recruited vocalist Chris Farlowe to enable Clempson to concentrate on guitar.