The necessary steps include the following:

1. Insert the following imports to the project:

import java.io.StringReader;
import java.util.List;
import edu.stanford.nlp.ling.CoreLabel;
import edu.stanford.nlp.process.CoreLabelTokenFactory;
import edu.stanford.nlp.process.PTBTokenizer;
import edu.stanford.nlp.process.WordToSentenceProcessor;

2. Add the following instance variable, which will hold the series of sentences to be processed:

private static String text = 
    "We will start with a simple sentence. However, is it "
    + "possible for a sentence to end with a question "
    + "mark? Obviously that is possible! Another "
    + "complication is the use of a number such as 56.32 "
    + "or ellipses such as ... Ellipses may be found ... "
    + "with a sentence! Of course, we may also find the "
    + "use of abbreviations such as Mr. Smith or "
    + "Dr. Jones.";

3. Add the following code to the main method:

PTBTokenizer<CoreLabel> ptbTokenizer = new PTBTokenizer<CoreLabel>(
    new StringReader(text),
    new CoreLabelTokenFactory(), null);
WordToSentenceProcessor<CoreLabel> wordToSentenceProcessor = 
    new WordToSentenceProcessor<CoreLabel>();
List<List<CoreLabel>> sentenceList = 
    wordToSentenceProcessor.process(ptbTokenizer.tokenize());

for (List<CoreLabel> sentence : sentenceList) {
    System.out.println(sentence);
}

4. Execute the code. You will get the following output:

[We, will, start, with, a, simple, sentence, .]
[However, ,, is, it, possible, for, a, sentence, to, end, with, a, question, mark, ?]
[Obviously, that, is, possible, !]
[Another, complication, is, the, use, of, a, number, such, as, 56.32, or, ellipses, such, as, ..., Ellipses, may, be, found, ..., with, a, sentence, !]
[Of, course, ,, we, may, also, find, the, use, of, abbreviations, such, as, Mr., Smith, or, Dr., Jones, .]