Complex sentence: During his incarceration Badat assisted British and US authorities with information which will be used in the US prosecution of Adis Medunjanin, one of those suspected in a 2009 plot to attack the New York Subway.
Split into simpler sentences: During his incarceration, Badat assisted British and US authorities with information. It was to be used in the US prosecution of Adis Medunjanin, a suspect in a 2009 plot to attack the New York Subway.