Add spaces: Wehavespentmanyyearsidentifyingwhichsourceswecanuse-andwestilldo.

Answer: We have spent many years identifying which sources we can use - and we still do.

Add spaces: Youwastrappedinsideahousewhileinsearchofsomeobjects.

Answer: You was trapped inside a house while in search of some objects.

Add spaces: Fibonacci'sworkinnumbertheorywasalmostwhollyignoredandvirtuallyunknownduringtheMiddleages.

Answer:
Fibonacci's work in number theory was almost wholly ignored and virtually unknown during the Middle ages.