While others gather in areas, a man in a brown shirt sits with reading material in hand.
A shy person is reading alone because he doesn't like to socialize.
A person who is reading while others gather isn't necessarily shy.  He isn't necessarily reading because he doesn't like to socialize.  A person who is reading while others gather together isn't necessarily alone.  He might have a dog or a baby with him.
exists p1 p2 p3.(exists e2 e3 s1 x3 x4 x5 x6 x7.(with(e2,e3) & in(e3,x7) & n_hand(x7) & Theme(e3,x6) & Actor(e3,x5) & v_read(e3) & n_material(x6) & Actor(e2,x3) & v_sit(e2) & in(x3,x4) & n_shirt(x4) & a_brown(s1) & Theme(s1,x4) & n_man(x3)) & exists e1 x1 x2.(in(e1,x2) & n_area(x2) & Actor(e1,x1) & v_gather(e1) & -(x1 = x2) & n_person(x2) & n_person(x1)) & while(p2,p3))
exists e1 p1 s1 s2 x1 x2.(-exists e2 p2.(Topic(e2,p2) & Actor(e2,x1) & v_like(e2) & exists e3.(Actor(e3,x1) & v_socialize(e3))) & n_male(x1) & because(e1,p1) & a_alone(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_thing(x2) & n_person(x1) & a_shy(s1) & Theme(s1,x1))