Firemen clean up the scene of a major motor vehicle accident, in which a sedan and a truck collided and are both smashed.
The firemen are cleaning up the crash because its their truck that caused it.
The fact that firemen clean up the scene of a major motor vehicle accident, in which a sedan and a truck collided and are both smashed doesn't imply that they are doing the cleaning because its their truck that caused it.
(x)
exists e1 p1 s1 s2 x1 x2 x3.(n_thing(x2) & n_thing(x2) & n_truck(x3) & a_that(s2) & Theme(s2,x3) & of(x3,x2) & n_crash(x2) & n_fireman(x1) & exists e2 x4.(Theme(e2,x2) & Actor(e2,x3) & v_cause(e2) & Time(x3,x4) & n_its(x4)) & because(e1,p1) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_clean(e1))