Person in bear costume has taken off mask in public.
the bear costume person took off the mask.
The bear costume person could take off a mask anywhere, not only in public. (I think the two sentences are backwards).
exists e1 s1 x1 x2 x3 x4 x5.(in(e1,x5) & n_public(x5) & a_off(s1) & Manner(e1,s1) & Theme(e1,x4) & Actor(e1,x1) & v_take(e1) & n_mask(x4) & in(x1,x2) & n_costume(x2) & of(x2,x3) & n_bear(x3) & n_person(x1))
exists e1 s1 x1 x2 x3 x4.(n_mask(x4) & n_person(x1) & of(x1,x3) & n_costume(x3) & of(x1,x2) & n_bear(x2) & a_off(s1) & Manner(e1,s1) & Theme(e1,x4) & Actor(e1,x1) & v_take(e1))