Is this sentence correct?

[irmamar]

A prolongued period of peace was thought to be necessary to allow economic recovery.

That "to be necessary" raises my doubts.

Thanks. :)

[Perikles]

A prolongued period of peace was thought to be necessary to allow economic recovery.

That "to be necessary" raises my doubts.

Thanks. :)All correct! Except why the u in prolonged? :thinking::p:D

[irmamar]

All correct! Except why the u in prolonged? :thinking::p:D

:o Really, I don't know (although I guess why). ;)

Thanks. :)