Complex sentence: Wiener is also a member of the Council on Foreign Relations, where he has been active in promoting the consideration of non-lethal military technologies; in particular, he chaired and authored the report of a CFR Independent Task Force on the subject.
Split into simpler sentences: Wiener is also a member of the Council on Foreign Relations. There, he has been active in promoting the consideration of non-lethal military technologies; in particular, he chaired and authored the report of a CFR Independent Task Force on the subject.