When he pulled the wagon forward, the ball rolled to the back of the wagon, then when the wagon stopped, the ball rolled to the front.
(he; pulled; the wagon; forward) (the wagon; stopped; ) (the ball; rolled; to the front; T:then; T:when the wagon stopped) Context(the ball rolled,List([105, 120))):(the ball; rolled; to the back of the wagon; T:When he pulled the wagon forward)
the ball rolled,List([105, 120))
he the wagon the ball the ball
pulled stopped rolled rolled
the wagon forward
to the front T:then T:when the wagon stopped
to the back of the wagon T:When he pulled the wagon forward