Complex sentence: Collective cognition in social animal groups is useful because in can amplify its overall responsiveness to detecting ecological cues, and for humans, the computational power of a group can be more effective than that of even its best individuals.
Split into simpler sentences: Collective cognition in social animal groups is adaptive because the group can amplify its overall responsiveness to ecological cues. Likewise, the computational power of a human group can be more effective than that of even its best individuals.