Many cyclists ride past a group of onlookers.
onlookers  watch cyclists
The onlookers may be watching another event entirely when the cyclists pass. They are not there to watch cyclists.
exists e1 x1 x2 x3.(past(e1,x2) & of(x2,x3) & n_onlooker(x3) & n_group(x2) & Actor(e1,x1) & v_ride(e1) & n_cyclist(x1) & n_quantity(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_cyclist(x2) & n_onlooker(x1))