Several men riding elephants through the street.
Parade featuring elephant riders.
The first sentence does not imply that there is a parade.
exists e1 s1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & through(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_elephant(x3) & (x1 = x2) & n_man(x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(ne_nam_parade(x1) & Theme(e1,x2) & Actor(e1,x1) & v_feature(e1) & n_rider(x2) & of(x2,x3) & n_elephant(x3))