Used to be able to [closed]
Solution 1:
Consider the sequence of events in time. First, there was a period when demons were able to take over bodies; second, at the end of that period, at some time in the past, Lucifer removed that ability from the demons; third, a period of time passed; and last, the demons now give us their account of these events.
These are the events described by your prose. Any considerations of when the demons received the ability or how it evolved are mere speculation and are not dealt with by the prose.