(S (S (BASENP (NNP Muhammad) (NNP Ahmed)) (VP (VP (VP (VBD landed) (ADVP (RB back) (PP (TO to) (NP (BASENP (PRPD his) (NN home)) (PP (IN in) (BASENP (NNP Karachi))))))) (PP (IN from) (SBAR (WHADVP (WRB where)) (S (BASENP (PRP he)) (VP (VBD had) (VP (VBN disappeared) (ADVP (BASENP (NN five) (NNS years)) (RB back)))))))) (COMMA ,) (PP (IN with) (BASENP (PRPD his) (NN family))))) (PERIOD .))