en_tn_lite_do_not_use/2co/12/21.md

I might be grieved by many of those who have sinned before now and who did not repent ... that they practiced

This can be stated in active form. Alternate translation: "I will grieve because many of you have sinned before now and have not repented ... that you have practiced" (See: rc://en/ta/man/translate/figs-activepassive)

did not repent of the impurity and sexual immorality and lustful indulgence

Possible meanings are 1) Paul is saying almost the same thing three times for emphasis. Alternate translation: "did not stop commiting the sexual sins that they practiced" or 2) Paul is speaking of three different sins. (See: rc://en/ta/man/translate/figs-parallelism)

of the impurity

The abstract noun impurity can be translated as "things that do not please God." Alternate translation: "of secretly thinking about and desiring things that do not please God" (See: rc://en/ta/man/translate/figs-abstractnouns)

of the ... sexual immorality

The abstract noun "immorality" can be translated as "immoral deeds." Alternate translation: "of doing sexually immoral deeds" (See: rc://en/ta/man/translate/figs-abstractnouns)

of the ... lustful indulgence

The abstract noun "indulgence" can be translated using a verb phrase. Alternate translation: "of ... doing things that satisfy immoral sexual desire" (See: rc://en/ta/man/translate/figs-abstractnouns)