"I wasn't aware of where"
"One single bit of information" or "One single fact"
"as can be possible"
I would actually break up that sentence with a few commas:
"One single bit of information was necessary for me to realize that an object, that advanced, existing in Core City at the time of the Faceless invasion, was as far from a coincidence as can be possible."
I might even say "that technologically advanced" just for clarity.
2nd pic
"had been left largely intact"