Complex sentence: They formerly were assigned to the genus "Hyracotherium", but the type species of that genus now is regarded to be not a member of this family, but the other species have been split off into different genera.
Split into simpler sentences: They formerly were assigned to the genus "Hyracotherium", but the type species of that genus now is regarded to be not a member of this family. The other species have been split off into different genera.