Complex sentence: The institute is also the successor to the Nuclear Energy Board and as the Irish Government no is longer pursuing a nuclear power option the Nuclear Energy Board was formally wound up by the same 1991 Act of the Oireachtas.
Split into simpler sentences: The institute is also the successor to the Nuclear Energy Board. The Irish Government no is longer pursuing a nuclear power option, and the Nuclear Energy Board was formally wound up by a 1991 Act of the Oireachtas.