つきましては => about; concerning; regarding N2
Cause, reason
しまつだ => Denotes negative results A N1
Reason, Result, Response
ませんでした => Did not... N5
Negation in the past
まんまと => successfully, fairly, artfully, nicely, thoroughly N1
Exclamatory
と言っていました => Someone said... N4
Speaking
~ました/~ませんでした => Polite, past form of verb N5
Verb suffixes
ひとつまちがえば => Just (negligence) N3
Ability
~しまつだ      => end up; in the end; as a result (negative) N1
べつだんの => particular; special N2
Description
てしまった => to finish N4
Description
てすみません => I'm sorry for... N4
もし~としても/もし~としたって => Assuming; Even if ~ N3