A fencing class takes place on a basketball court.
people fencing
The second sentence only conveys the most basic idea from the sentence regarding the fencing class, omitting all detail.
exists e1 s1 x1 x2 x3 x4.(on(e1,x3) & n_court(x3) & of(x3,x4) & n_basketball(x4) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_place(x2) & n_class(x1) & a_fencing(s1) & Theme(s1,x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_fence(e1) & (x1 = x2) & n_people(x1))