A male is sitting in a chair with a blue surgical mask on.
A man is standing in front of a snack machine.
The first  sentence is about a man sitting in a chair while the second is about a man standing in front of a snack machine.
exists e1 s1 s2 s3 x1 x2 x3.(a_on(s3) & Manner(e1,s3) & with(e1,x3) & n_mask(x3) & a_surgical(s2) & Theme(s2,x3) & a_blue(s1) & Theme(s1,x3) & in(e1,x2) & n_chair(x2) & Actor(e1,x1) & v_sit(e1) & n_male(x1))
exists e1 x1 x2 x3 x4.(in(e1,x2) & of(x2,x3) & n_machine(x3) & of(x3,x4) & n_snack(x4) & n_front(x2) & Actor(e1,x1) & v_stand(e1) & n_man(x1))