Motorcycles are parked behind a fence on a crowded street.
Motorcycles are parked next to a fence where the street is crowded
Next to a fence is a rephrasing of behind a fence.
exists e1 s1 x1 x2 x3.(behind(e1,x2) & on(x2,x3) & n_street(x3) & a_crowded(s1) & Theme(s1,x3) & n_fence(x2) & Theme(e1,x1) & v_park(e1) & n_motorcycle(x1))
exists e1 p1 x1 x2 x3.(n_street(x3) & to(e1,x2) & exists e2.(Theme(e2,x3) & v_crowd(e2)) & where(x2,p1) & n_fence(x2) & r_next(e1) & Theme(e1,x1) & v_park(e1) & n_motorcycle(x1))