Indeed, the central purpose of language, from its moment of emergence, is  communication, social contact, infiuencing surrounding individuals. 
( Indeed ( , ( ( ( ( ( ( the ( central purpose ) ) ( of language ) ) , ) ( from ( ( its moment ) ( of emergence ) ) ) ) , ) ( ( is ( ( ( ( communication , ) ( social contact ) ) , ) ( infiuencing ( surrounding individuals ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Indeed)) (, ,) (NP (NP (DT the) (JJ central) (NN purpose)) (PP (IN of) (NP (NN language))) (, ,) (PP (IN from) (NP (NP (PRP$ its) (NN moment)) (PP (IN of) (NP (NN emergence))))) (, ,)) (VP (VBZ is) (NP (NP (NP (NN communication)) (, ,) (NP (JJ social) (NN contact)) (, ,)) (VP (VBG infiuencing) (S (VP (VBG surrounding) (NP (NNS individuals))))))) (. .)))
Communication, social contact, influence and other factors form the central purpose of language.
( ( ( ( ( ( ( Communication , ) ( social contact ) ) , ) influence ) and ) ( other factors ) ) ( ( form ( ( the ( central purpose ) ) ( of language ) ) ) . ) )
(ROOT (S (NP (NP (NNP Communication)) (, ,) (NP (JJ social) (NN contact)) (, ,) (NP (NN influence)) (CC and) (NP (JJ other) (NNS factors))) (VP (VBP form) (NP (NP (DT the) (JJ central) (NN purpose)) (PP (IN of) (NP (NN language))))) (. .)))