(S (S (NP (BASENP (NNS Systems)) (SBAR (WHNP (WDT which)) (S (VP (VBP enable) (NP (BASENP (DT the) (NNPS iPhones)) (PP (IN for) (BASENP (NN service)))))))) (VP (VP (VBD had) (BASENP (NN difficulty))) (PP (JJ due) (PP (TO to) (NP (BASENP (NN network) (NNS failures)) (CC and) (NP (BASENP (JJ insufficient) (NN capacity)) (SBAR (S (VP (TO to) (VP (VP (VB meet) (NP (BASENP (DT the) (NN demand)) (PP (IN for) (BASENP (JJ first-day) (NNS sales))))) (COMMA ,) (PP (ADVP (RB particularly)) (PP (PP (PP (IN in) (BASENP (DT the) (NNP United) (NNPS States))) (PP (IN at) (BASENP (NNP Apple) (CC and) (NNP AT&T) (NNS stores)))) (CONJP (COMMA ,) (CC and)) (PP (IN in) (BASENP (NNP Canada))))))))))))))) (PERIOD .))