A woman in a floral shirt and white gloves balances a fishbowl on her head.
A woman is doing a street performance.
The first sentence does not explain why the woman is balancing a fishbowl.  There are many reasons to balance a fishbowl besides doing a street performance.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6.(Theme(e1,x5) & Actor(e1,x1) & v_balance(e1) & on(x5,x6) & n_head(x6) & of(x6,x1) & n_female(x1) & n_fishbowl(x5) & in(x1,x2) & subset_of(x4,x2) & n_glove(x4) & a_white(s2) & Theme(s2,x4) & subset_of(x3,x2) & n_shirt(x3) & a_floral(s1) & Theme(s1,x3) & n_woman(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_performance(x2) & of(x2,x3) & n_street(x3) & n_woman(x1))