Complex sentence: This is not to say that all forms of terrorist acts are committed by people that are religious, in 83% of the suicide attackers worldwide between 1980 and 2003 only 43% were identifiably religious.
Split into simpler sentences: This is not to say that all forms of terrorist acts are committed by people that are religious. In 83% of the suicide attackers worldwide, between 1980 and 2003, only 43% were identifiably religious.