Complex sentence: IGN called it "possibly the most docile, unassuming, and weak of all the monsters in the Pokémon world" and further described it as serving solely as comic relief, until its evolution into Gyarados.
Split into simpler sentences: IGN called it "possibly the most docile, unassuming, and weak of all the monsters in the Pokémon world". They further described it as serving solely as comic relief, until its evolution into Gyarados.