Complex sentence: Also that month, Chris Bailey joined on bass guitar (ex-Red Angel Panic, Headband) providing the choice for lead vocalist as Neeson's "gruff shout" or John Brewster's "clear tones".
Split into simpler sentences: Also that month, Chris Bailey joined on bass guitar (ex-Red Angel Panic, Headband). The group's choice for lead vocals was either Neeson's "gruff shout" or John Brewster's "clear tones".