Complex sentence: Sebaceans seem to make up the bulk of the Peacekeepers and other members are the half-breed Scorpius, a notable exception who had to prove his loyalty to be declared exempt from the peacekeepers racial purity rules.
Split into simpler sentences: Sebaceans seem to make up the bulk of the Peacekeepers. Other Peacekeepers featured in the series include the half-breed Scorpius, a notable exception who had to prove his loyalty to be declared exempt from the peacekeepers racial purity rules.