A person, who appears to be male, is riding a dirt bike on a gravelly course.
The person is driving a tank on the course.
You cannot be riding a dirt bike and driving a tank at the same time you can only do one or the other.
exists e1 e2 p1 s1 x1 x2 x3 x4 x5.(on(e2,x5) & n_course(x5) & a_gravelly(s1) & Theme(s1,x5) & Theme(e2,x3) & Actor(e2,x1) & v_ride(e2) & n_bike(x3) & of(x3,x4) & n_dirt(x4) & Topic(e1,p1) & Actor(e1,x2) & v_appear(e1) & exists s2.(Theme(s2,x2) & a_male(s2)) & (x1 = x2) & n_person(x1))
exists e1 x1 x2 x3.(n_course(x3) & n_person(x1) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_tank(x2))