Original: Examples include the Gnostics (who had believed in an esoteric dualism called gnosis), the Ebionites (who denied the divinity of Jesus), and the Arians (who believed Jesus said "My Father is greater than I").
Simplified: Examples include the Gnostics (who had believed in an esoteric dualism), the Ebionites (who venerated Christ's blood relatives), and the Arians.