Complex sentence: The Journal initially levied an Author Processing Charge (APC) of $695, but with an "introductory rate" of $395, but by 2013 this was reduced to $99 to encourage more submissions.
Split into simpler sentences: The journal initially levied an author processing charge of $695, but with an "introductory rate" of $395. By 2013, this had been reduced to $99 to encourage more submissions.