Complex sentence: Eutheriodonts appeared Middle Permian (probably a little later after the first theriodonts appeared), evolved from a Gorgonopsian-like theriodont.
Split into simpler sentences: Eutheriodonts appeared Middle Permian (probably a little later after the first theriodonts appeared). The Eutheriodonts evolved from a Gorgonopsian-like theriodont.