(S (S (SBAR (IN Since) (S (BASENP (JJ high) (NN estrogen) (NNS levels)) (VP (MD can) (VP (VB cause) (NP (BASENP (JJ menstrual) (NN bleeding)) (CC and) (BASENP (NN breast) (NN development))))))) (COMMA ,) (S (BASENP (DT the) (NN surgery)) (VP (VBD was) (VP (ADVP (RB also)) (VP (VBN meant) (S (VP (TO to) (VP (VB limit) (BASENP (DT these) (NNS effects)))))))))) (PERIOD .))