Riding a red motorcycle, with appropriate equipment.
The man is a professional.
Not everyone riding a motorcycle is a man or a professional.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & with(x2,x3) & n_equipment(x3) & a_appropriate(s2) & Theme(s2,x3) & n_motorcycle(x2) & a_red(s1) & Theme(s1,x2) & n_thing(x1))
exists p1 x1.(n_man(x1) & exists x2.((x1 = x2) & n_professional(x2)))