There are two carts being driven by mules, each carrying some crops and people.
The mules are pulling the carts.
Carts driven by mules can be explained as mules pulling carts. Mules obviously do not drive in the literal sense of the word, but they are causing the motion of the carts in this case.
exists p1 x1 e1 x2 x3 x4 x5 x6.((x1 = x2) & Actor(e1,x4) & rel(x4,x5) & subset_of(x6,x5) & n_people(x6) & all x7.(n_thing(x7) -> exists e2 x8 x9.(subset_of(x7,x5) & Theme(e2,x9) & Actor(e2,x8) & v_carry(e2) & n_crop(x9) & (x7 = x8))) & n_mule(x4) & Theme(e1,x3) & v_drive(e1) & (x2 = x3) & n_cart(x2) & card_eq_2(x2))
exists e1 x1 x2.(n_cart(x2) & n_mule(x1) & Theme(e1,x2) & Actor(e1,x1) & v_pull(e1))