Preview:
public static string GetLastInstanceOf(string sentence)
        {
            string returnValue = sentence;

            var matches = System.Text.RegularExpressions.Regex.Matches(sentence, @"\(([^)]*)\)");
            if (matches.Count > 0)
            {
                returnValue = matches.Last().Groups[1].Value;
            }

            return returnValue;

        }
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