Original: This reference apparently alludes to the precarious political scenario following the collapse of Mauryan and Sunga dynasties in northern India and its occupation by foreign hordes of the Shakas , Yavanas , Kambojas and Pahlavas .
Simplified: This seems to mean the situation after the Mauryan and Sunga dynasties fell apart and northern India was occupied by foreign armies of the Shakas , Yavanas , Kambojas and Pahlavas .