sentence: It 's known that over the years the system has improved and new means of transport have been offered , such as trains and trolleys , all of them with just one objective : to transport a mass of people quickly .
modified: It 's known that over the years the system have improved and new means of transport have been offered such as trains and trolleys all of them with just one objective to transport a mass of people at a quick time .
transformation: VERB:SVA, PUNCT, PUNCT, PUNCT, OTHER