( Some ( ( demographers ( ( ( ( classify population ) ( by language ) ) , ) ( because ( people ( who ( ( ( share ( communication form ) ) ( online communities ) ) ( regardless ( of ( where ( they live ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Some)) (VP (VBZ demographers) (VP (VB classify) (NP (NN population)) (PP (IN by) (NP (NN language))) (, ,) (PP (IN because) (NP (NP (NNS people)) (SBAR (WHNP (WP who)) (S (VP (VBP share) (NP (NN communication) (NN form)) (PP (NN online) (NP (NNS communities))) (ADVP (RB regardless) (PP (IN of) (SBAR (WHADVP (WRB where)) (S (NP (PRP they)) (VP (VBP live))))))))))))) (. .)))
Some demographers classify population by language, because people who share communication form online communities regardless of where they live.
(ROOT (S (NP (NP (NNS Populations)) (VP (VBG living) (PP (IN in) (NP (CD one) (NN place))))) (VP (VBP form) (NP (DT a) (NN community))) (. .)))