Someone is riding a three-wheeled vehicle throught a sandy playground.
The vehicle goes through sand on the playground.
A three-wheeled vehicle is a type of vehicle. For a vehicle to go "throught a sandy playground", the vehicle must go through sand that is on a playground.
exists x1.(all x2 x3.((n_playground(x2) & of(x2,x3) & n_sandy(x3)) -> exists e1 s1 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_ride(e1) & for(x4,x2) & n_throught(x4) & of(x4,x5) & n_vehicle(x5) & a_three-wheeled(s1) & Theme(s1,x4))) & n_person(x1))
exists e1 x1 x2 x3.(n_playground(x3) & n_vehicle(x1) & on(e1,x3) & through(e1,x2) & n_sand(x2) & Actor(e1,x1) & v_go(e1))