How would I change these sentences from the passive to active voice?

The Epistle to the Hebrews is said to have been written anywhere from 60-95 C.E . The authorship of the Epistle to the Hebrews has been a heavily debated issue since the passage was written, because it is unknown. It was believed for a great length of time that Paul was the original author, however with comparing this writing to his other epistles, it lacked many similarities.