Clerical Celibacy is a disciple rather than a dogma. It is especially prominent in the Latin rite. There are other rites in the Roman Catholic Church and some of them have married priests. When priests convert to Catholicism they are usually allowed to remain priests if they wish. They often have to be actually ordained. If they were married and ordained both stick. Neither is reversible. If they are married and "ordained" they can still be ordained.