Complex sentence: During the events of "United We Stand", Jefferson was captured by S.H.I.E.L.D. only to be attacked by Hydra, attempting to get Jefferson to join HYDRA, but he kills them all and returns home to Rio.
Split into simpler sentences: During the events of "United We Stand", Jefferson was captured by S.H.I.E.L.D. only to be attacked by Hydra. They attempted to get Jefferson to join them, but he kills them all and returns home to Rio.