Learning to combine ideas into more complex sentences is an important skill in writing. There are many ways to do this--many possible bonus points! Combine the following three sentences.
Sentence 1: The snowfall lay heavily on the ground.
Sentence 2: People were shovelling driveways and sidewalks and piling up snow into snow mountains.
Sentence 3: There was little traffic on the roads until the snow ploughs had cleared the major routes.