A baseball player slides into base as the baseman catches the ball and the umpire observes the play.
The umpire kept an eye on the players during the game.
When an umpire kept an eye on the players, he observes the play.
exists e1 p1 x1 x2 x3 x4 x5 x6 x7.(n_play(x7) & n_umpire(x6) & n_ball(x5) & n_baseman(x4) & exists e2 e3.(Theme(e3,x7) & Actor(e3,x6) & v_observe(e3) & Theme(e2,x5) & Actor(e2,x4) & v_catch(e2)) & as(e1,p1) & into(e1,x3) & n_base(x3) & Actor(e1,x1) & v_slide(e1) & n_player(x1) & of(x1,x2) & n_baseball(x2))
exists e1 x1 x2 x3 x4.(n_game(x4) & n_player(x3) & n_umpire(x1) & during(e1,x4) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_keep(e1) & n_eye(x2))