Complex sentence: It is often criticised for this policy, as opponents believe that it bans transsexual women from attending (which contradicts on the MWMF policy of those who "currently identify as women", which transsexual women do), and is thus transphobic.
Split into simpler sentences: It is often criticised for this policy, as it bans transsexual women from attending. Oppenents believe that this contradicts on the MWMF policy of those who "currently identify as women", which transsexual women do, and is thus transphobic.