Complex sentence: From an evolutionary perspective, the jealousy arises from this threat of investing in non-biologically related offspring and thus is most strongly felt over their mate's sexual infidelity and can take several forms in behaviour: aggression and violence, and possessiveness or controlling behaviour towards their mate.
Split into simpler sentences: From an evolutionary perspective, the jealousy arises from this threat of investing in non-biologically related offspring and thus is most strongly felt over their mate's sexual infidelity. It can take several forms in behaviour: aggression and violence, and possessiveness or controlling behaviour towards their mate.