@notanenglish,
In accordance with Mac's crit
While fleeing, not many people actually escaped
….reason: "used to" somehow interrupts one's train of understanding
While supposedly fleeing, not many had actually escaped
….."Supposedly" introducing a kind of uncertainty; the"people" deleted as somewhat redundant
Formerly, in their initial attempts at escape not many of them actually succeeded
…..supposing an earlier context defining the time period. Commas incidentally on their way out
While fleeing, however, not many of them actually escaped
….again taking liberties in the assumption of context, the "however" providing a link to the previous thought; with "them" serving much the same purpose in identifying the particular group trying to get away
So I wonder Not whether I might have been of any help at all
…forgiving the pun