RobH_en_tn/2pe/03/07.md

the heavens and the earth are reserved for fire by that same command

This can be stated in active form. Alternate translation: "God, by that same word, has reserved the heavens and the earth for fire" (See: rc://en/ta/man/translate/figs-activepassive)

that same command

Here "command" stands for God, who will give the command: AT "God, who will give a similar command"

They are reserved for the day of judgment

This can be stated in active form and can begin a new sentence. Alternate translation: "He is reserving them for the day of judgment" (See: rc://en/ta/man/translate/figs-activepassive)

for the day of judgment and the destruction of the ungodly people

This can be stated with verbal phrases. Alternate translation: "for the day when he judges and destroys ungodly people" (See: rc://en/ta/man/translate/figs-abstractnouns)