A man in a blue shirt with white flowers is playing a saxophone.
A man is playing a saxophone while some people gather to watch.
For a man to be playing the saxophone doesn't mean he is playing while some people gather to watch, he could be playing alone.
exists e1 s1 s2 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_play(e1) & n_saxophone(x4) & in(x1,x2) & with(x2,x3) & n_flower(x3) & a_white(s2) & Theme(s2,x3) & n_shirt(x2) & a_blue(s1) & Theme(s1,x2) & n_man(x1))
exists e1 p1 x1 x2.(exists e2 p2 x3.(Topic(e2,p2) & Actor(e2,x3) & v_gather(e2) & exists e3.(Actor(e3,x3) & v_watch(e3)) & n_people(x3)) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_saxophone(x2) & n_man(x1))