＜At the top end of the global urbanization league＞ lie＜,unsurprisingly,＞a number of small countries and city-states.

S＝a number of small countries and city-states.
V＝lie
文頭に場所を表す副詞句＜At the top end of the global urbanization league＞があるので倒置している
＜,unsurprisingly,＞は文修飾の副詞