A young man rides a self built bicycle across the street.
the man is riding a bike.
Young man is a man, and a self built bicycle is a type of bike.
exists e2 e1 s1 x1 x2 x3 x4.(n_street(x4) & Theme(e2,x2) & Actor(e2,x1) & v_ride(e2) & across(x2,x4) & n_bicycle(x2) & Theme(e1,x2) & v_build(e1) & of(x2,x3) & n_self(x3) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2))