Of course those opposed to his views still strongly attacked him and these attacks became even stronger after he was appointed as Regius Professor of Philosophy and Eloquence at the Collge de France in 1551

What is the correctly punctuated version of this sentence?
Of course those opposed to his views still strongly attacked him and these attacks became even stronger after he was appointed as Regius Professor of Philosophy and Eloquence at the College de France in 1551.