An older man sitting on an undetermined structure along a busy sidewalk.
The older man was the only person on the sidewalk.
A busy sidewalk means there isn't the man isn't the only person on the sidewalk.
exists e1 s1 s2 s3 x1 x2 x3 x4.(a_topic(x1) & along(x1,x4) & n_sidewalk(x4) & a_busy(s3) & Theme(s3,x4) & on(e1,x3) & n_structure(x3) & a_undetermined(s2) & Theme(s2,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1))
exists p1 s1 x1 x2 x3.(n_sidewalk(x3) & all x4.(n_person(x4) -> (x2 = x4)) & n_person(x2) & n_man(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1) & (x1 = x2) & on(x2,x3))