You are going to have an endless struggle developing a macro to achieve your desired result. While you example is clear enough, the problem is that Word has no fundamental concept of what a sentence is. To Word, all periods in text constitutes a sentence. So if your example looked like:
Mr. Sam went to the St. Charles St. Bank and withdrew two hundred dollars from Mr. Smith’s account before going to Dr. Harry’s Turkey Shop on N. Cherry St. to get a turkey on his way to his grandparent’s house at 9 Miller Ave. Tallahassee FL for dinner.
To you an I, that looks like one very long sentence. To Word, it is 9 separate sentences. I have a fairly lengthy explanation of all this as well as an AddIn for evaluating deduced sentences: Deduced Sentences
It may help you identify your sentences but nothing will be perfect.