Complex sentence: The evolutionary psychology perspective has been supported by a study conducted by David Buss in which observed that male sexual jealousy is triggered by sexual infidelity, whereas female sexual jealousy was found to be triggered by emotional infidelity.
Split into simpler sentences: The evolutionary psychology perspective has been supported by a study conducted by David Buss. He observed that male sexual jealousy is triggered by sexual infidelity, whereas female sexual jealousy was triggered by emotional infidelity.