QUES: The idea of the devil being a specific person outside of us rather than the principle of sin within us is an attempt to move the responsibility for our sins away from ourselves

correct the punctuation.

CORRECTED: The idea of the devil being a specific person outside of us rather than the principle of sin within us is an attempt to move the responsibility for our sins away from ourselves.

QUES: The coup dtat was marvelously simple

correct the punctuation.

CORRECTED: The coup detat was marvelously simple.

QUES: At the core of the new Royal Arsenal Museum were the collections and staff of The Historical Arms Collection

correct the punctuation.

CORRECTED:
At the core of the new Royal Arsenal Museum were the collections and staff of The Historical Arms Collection.