Hm. Okay, the way it was written made me misinterpret the sentence.
"the system". So they refer to "the system used" as simple. But then I would have written it like "the system used, to allocate areas of unused memory to new tasks, was pretty simple.". Without using "," before and after "to allocate areas of unused memory to new tasks" I don't really find it an easy read.
So... "was pretty simple" is now what determines how "the system used to" should be interpreted. Since it on the first read could easly be interpreted as someting like "(once upon a time) the system did allocate memory", until reaching the end of the sentince, instead of "the system (that was) used to" I would still say that it is a rather vague sentence. I think at least SOME of my past english teachers would agree with me... :lol: