Original sentence: The geographic context of the novel is the city of Medellín (Colombia) during the 1990s, a difficult time for Colombian society, when mafias declared a terrorist war against the State and  Colombian institutions, leaded by the infamous Pablo Escobar Gaviria
Edited sentence: The geographic context of the novel is the city of Medellín (Colombia) during the 1990s, a difficult time for Colombian society, when mafias declared a terrorist war against the State and  Colombian institutions, led by the infamous Pablo Escobar Gaviria