Men dressed in either theatrical or historical attire riding horses.
Men are on horses that are moving.
The men are riding horses so the horses are moving.
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 p1 x1.(exists e1 x2 x3.(on(x1,x2) & Actor(e1,x3) & v_move(e1) & (x2 = x3) & n_horse(x2)) & n_man(x1))