Simplify the following text for a Grade 9 native English-speaking person.
Original: ` Pelycosaurs ' make up a paraphyletic grouping of the six most primitive families of synapsids . They were all rather lizard-like with sprawling gait and possibly horny scutes .
Simplified: Pelycosaurs are a paraphyletic group of six primitive families of synapsids .120 They were all rather lizard-like with sprawling gait and possibly horny scutes .