Complex sentence: The presence of the Triskelion caused some vocal concerns from the Iranian government, in which S.H.I.E.L.D. temporarily relocated their headquarters to Stark Industries, and, with help from the European Defense Initiative, trying to find a way to return the Triskelion back to New York.
Split into simpler sentences: The presence of the Triskelion caused some vocal concerns from the Iranian government, in which S.H.I.E.L.D. temporarily relocated their headquarters to Stark Industries. With help from the European Defense Initiative, S.H.I.E.L.D. was trying to find a way to return the Triskelion back to New York.