A group of people, some sitting and some standing, seem to be enjoying a sort of party, as there are streamers and balloons around them.
A group of people are at work sitting at desks.
In sentence 2, all are sitting. In sentence one, some are sitting and some are standing. Also, it is not usual to be at work and having a party.
exists e1 e2 p1 p2 x1 x2 x3 x4 x5 x6.(exists p3 x9 x10 x11 x12.((x9 = x10) & subset_of(x12,x10) & around(x12,x1) & n_balloon(x12) & subset_of(x11,x10) & n_streamer(x11)) & n_thing(x1) & as(e2,p2) & Topic(e2,p1) & Actor(e2,x1) & v_seem(e2) & exists e3 x7 x8.(Theme(e3,x7) & Actor(e3,x1) & v_enjoy(e3) & of(x7,x8) & n_party(x8) & n_sort(x7)) & rel(x1,x3) & subset_of(x6,x3) & n_standing(x6) & subset_of(x4,x3) & Actor(e1,x5) & v_sit(e1) & (x4 = x5) & n_thing(x4) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 p1 x1 x2 x3.(for(p1,e1) & at(e1,x3) & n_desk(x3) & Actor(e1,x1) & v_sit(e1) & exists x4.(at(x1,x4) & n_work(x4)) & of(x1,x2) & n_people(x2) & n_group(x1))