Paul is asking questions the Corinthians might be asking and then answering them to emphasize that he is as much a Jew as the super-apostles are. You should keep the question-and-answer form if possible. Alternate translation: "They say they are servants of Christ—I speak as though I were out of my mind—but I am more" (See: [[rc://en/ta/man/translate/figs-rquestion]])
You can make clear the understood information. Alternate translation: "I am more a servant of Christ than they are" (See: [[rc://en/ta/man/translate/figs-ellipsis]])
This is an idiom, and is exaggerated to emphasize that he had been beaten many, many times. Alternate translation: "I have been beaten very many times, and I have faced" or "I have been beaten too many times to bother counting, and I have faced" (See: [[rc://en/ta/man/translate/figs-idiom]] and [[rc://en/ta/man/translate/figs-hyperbole]])