(S (S (BASENP (PRP They)) (VP (VBP have) (VP (ADVP (RB already)) (VP (VP (VBN made) (S (BASENP (DT both) (NNS websites)) (ADVP (RBR safer)))) (PP (IN by) (S (VP (VBG implementing) (NP (NP (BASENP (NNS dozens)) (PP (IN of) (BASENP (NNS safeguards)))) (CC and) (NP (BASENP (DT a) (JJ special) (NNS features)) (SBAR (WHADVP (WRB where)) (S (NP (BASENP (NNS users)) (ADJP (ADJP (JJR older)) (PP (IN than) (NP (BASENP (DT the) (NN age)) (PP (IN of) (BASENP (NN 18))))))) (VP (VBP have) (NP (BASENP (NNS limitations)) (VP (VBG searching) (NP (NNS users) (NP (NP (QP (ADVP (RBR less) (IN than)) (NN 18)) (NNS years)) (PP (IN of) (BASENP (NN age))))))))))))))))))) (PERIOD .))