Complex sentence: Transsexual people desire to establish a permanent gender role as a member of the gender with which they identify, and many transsexual people pursue medical interventions as part of the process of expressing their gender.
Split into simpler sentences: Transsexual people desire to establish a permanent gender role as a member of the gender with which they identify. Many transsexual people pursue medical interventions as part of the process of expressing their gender.