A crowd watches a performance.
The crowd is watching acrobats perform.
Not all performances are of acrobats.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_performance(x2) & n_crowd(x1))
exists e1 p1 x1 x2.(n_crowd(x1) & exists e2.(Actor(e2,x2) & v_perform(e2)) & Recipient(e1,p1) & Actor(e1,x1) & Topic(e1,x2) & v_watch(e1) & n_acrobat(x2))