( Producers ( ( ( are also ) ( called autotrophs ) ) . ) )
(ROOT (S (NP (NNS Producers)) (VP (VBP are) (ADVP (RB also)) (VP (VBN called) (NP (NNS autotrophs)))) (. .)))
Producers are also called autotrophs.
(ROOT (S (NP (NNS Autotrophs)) (VP (VBZ is) (NP (NP (DT another) (NN name)) (PP (IN for) (NP (NNS producers))))) (. .)))