(S (S (PP (IN In) (BASENP (NN 1999))) (COMMA ,) (S (PP (IN after) (NP (BASENP (DT a) (JJ long) (NN period)) (PP (IN of) (BASENP (NN rest))))) (COMMA ,) (S (BASENP (DT the) (NN volcano)) (VP (VBD started) (NP (BASENP (DT an) (JJ eruptive) (NN process)) (SBAR (WHNP (WDT that)) (S (VP (VBZ continues) (PP (TO to) (BASENP (DT this) (NN day))))))))))) (PERIOD .))