The man wearing a blue helmet is riding a Polaris.
A lady repairs a broken Polaris.
The subject is either a man or lady, who either repairs or rides a Polaris.
exists e1 e2 s1 x1 x2 x3 x4.(n_man(x1) & Theme(e2,x4) & Actor(e2,x1) & v_ride(e2) & ne_org_polaris(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_helmet(x3) & a_blue(s1) & Theme(s1,x3) & (x1 = x2))
all s1 x1.((ne_geo_polaris(x1) & a_broken(s1) & Theme(s1,x1)) -> exists x2 x3.(a_topic(x2) & for(x2,x1) & n_repair(x2) & of(x2,x3) & n_lady(x3)))