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))))) (. .)))
There were other followings of extremists.
( There ( ( were ( ( other followings ) ( of extremists ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBD were) (NP (NP (JJ other) (NNS followings)) (PP (IN of) (NP (NNS extremists))))) (. .)))