sentence: Soon , one of them is informed that an asteroid hit a satellite and created debris which is heading for the Shuttle where the two astronauts are .
modified: Soon one of them was informed that an asteroid hit a satellite and created debris , which was heading for the Shuttle , where the two astronauts were .
transformation: PUNCT, VERB:TENSE, PUNCT, VERB:TENSE, PUNCT, VERB:TENSE