Other extremists had, and have, followings of their own.
( ( Other extremists ) ( ( ( ( ( ( had , ) and ) have ) , ) ( followings ( of ( their own ) ) ) ) . ) )
(ROOT (S (NP (JJ Other) (NNS extremists)) (VP (VP (VBD had)) (, ,) (CC and) (VP (VBP have)) (, ,) (NP (NP (NNS followings)) (PP (IN of) (NP (PRP$ their) (JJ own))))) (. .)))
Other extremists had similar ideas and easily had a following.
( ( Other extremists ) ( ( ( ( ( had ( similar ideas ) ) and ) easily ) ( had ( a following ) ) ) . ) )
(ROOT (S (NP (JJ Other) (NNS extremists)) (VP (VP (VBD had) (NP (JJ similar) (NNS ideas))) (CC and) (ADVP (RB easily)) (VP (VBD had) (NP (DT a) (NN following)))) (. .)))