Complex sentence: Those selected for longer death-feigning durations are at a selective advantage to those at shorter durations when a predator is introduced, Death feigning birds often take advantage of escape opportunities; tonic immobility in quail reduces the probability of the birds being predated by cats.
Split into simpler sentences: Those selected for longer death-feigning durations are at a selective advantage to those at shorter durations when a predator is introduced. Death-feigning birds often take advantage of escape opportunities; tonic immobility in quail reduces the probability of the birds being predated by cats.