Complex sentence: The pressure mounted by the US and Colombian governments to counter them led to the cartel's destruction, with key associates being gunned down by police and military forces or turning themselves in to authorities in exchange for lenient prison terms.
Split into simpler sentences: The pressure mounted by the US and Colombian governments to counter them led to the cartel's destruction. Most of the cartel's associates were gunned down by police and military forces or turned themselves in to authorities in exchange for lenient prison terms.