Biker in red and white helmet driving a red motorcycle.
a biker is driving
Biker in red and white helmet driving  is a rephrasing of a biker is driving.
exists e1 s1 s2 s3 s4 x1 x2 x3.(ne_nam_biker(s1) & a_topic(s1) & in(s1,x1) & Theme(e1,x3) & Actor(e1,x2) & v_drive(e1) & n_motorcycle(x3) & a_red(s4) & Theme(s4,x3) & (x1 = x2) & n_helmet(x1) & a_white(s3) & Theme(s3,x1) & a_red(s2) & Theme(s2,x1))
exists e1 x1.(Actor(e1,x1) & v_drive(e1) & n_biker(x1))