Complex sentence: A simple and singular determinant for sexual orientation has not been conclusively demonstrated--various studies point to different, even conflicting positions--but scientists hypothesize that a combination of genetic, hormonal and social factors determine sexual orientation.
Split into simpler sentences: A simple and singular determinant for sexual orientation has not been conclusively demonstrated as various studies point to different, even conflicting positions. Some scientists hypothesize that a combination of genetic, hormonal and social factors determine sexual orientation.