en_tn/2pe/02/06.md

reduced the cities of Sodom and Gomorrah to ashes

"burned the cities of Sodom and Gomorrah with fire until only ashes remained"

condemned them to destruction

Here the word "them" refers to Sodom and Gomorrah and the people who lived in them.

as an example of what is to happen to the ungodly

Sodom and Gomorrah serve as an example and a warning of what will happen to others who disobey God.