Complex sentence: Eventually, he accidentally kills Palamas while she is in disguise as May, and blaming S.H.I.E.L.D., decides to take over the now leader-less Hydra.
Split into simpler sentences: Eventually, he accidentally kills Palamas while she is in disguise as May. Blaming S.H.I.E.L.D. for this, Ward decides to take over the now leader-less Hydra.