Complex sentence: In season four, Oliver takes on a refined persona as "Green Arrow", and he and his allies fight against the terrorist organization H.I.V.E., headed by Damien Darhk (Neal McDonough), before he can destroy Star City (formerly Starling City).
Split into simpler sentences: In season four, Oliver takes on a refined persona as "Green Arrow". He and his allies fight against the terrorist organization H.I.V.E., headed by Damien Darhk (Neal McDonough), before he can destroy Star City (formerly Starling City).