Men dressed in either theatrical or historical attire riding horses.
The men rode the horses to the theater.
The fact that men dressed in theatrical attire are riding horses does not imply they rode the horses to the theater.
exists e1 x1 x2.(a_topic(x1) & all x3.((exists s1 x4 x5.(n_horse(x3) & of(x3,x5) & n_riding(x5) & of(x3,x4) & n_attire(x4) & a_theatrical(s1) & Theme(s1,x3)) | exists s2 x6 x7.(n_horse(x3) & of(x3,x7) & n_riding(x7) & of(x3,x6) & n_attire(x6) & a_historical(s2) & Theme(s2,x3))) -> in(e1,x3)) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(n_theater(x3) & n_horse(x2) & n_man(x1) & to(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1))