The people were busy reading materials.
The people were studying the reading material needed for work.
The people could have been reading for entertainment instead of reading stuff needed for work.
exists e1 p1 x1.(n_people(x1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_read(e2) & n_material(x2)) & Topic(e1,p1) & Actor(e1,x1) & v_busy(e1))
exists e2 e1 x1 x2 x3 x4 x5.(n_material(x2) & of(x2,x3) & n_reading(x3) & n_people(x1) & Theme(e2,x2) & Actor(e2,x1) & v_study(e2) & for(e1,x5) & n_work(x5) & Theme(e1,x4) & v_need(e1) & (x2 = x4))