Complex sentence: Currently, there are numerous explanations of the cause of transsexualism, linking the cause to genetics, brain structure, brain function and prenatal androgen exposure; in addition, other theories have proposed linking the cause to psychological and behavioral reasons.
Split into simpler sentences: Currently, there are numerous possible explanations of the cause of transsexualism, including genetics, brain structure, brain function, and prenatal androgen exposure. Other theories have proposed linking the cause to psychological and behavioral reasons.