(S (S (S (BASENP (DT The) (NNS protests)) (VP (VBD were) (ADJP (JJ peaceful)))) (COMMA ,) (SBAR (IN although) (S (BASENP (JJ minor) (NNS skirmishes)) (VP (MD did) (VP (VB occur) (PP (IN in) (BASENP (NNP Zurich) (CC and) (NNP Lucerne)))))))) (PERIOD .))