JSFiddle - React, Tailwind, and code Playground

JavaScript

var string = 'Question 6 of 7 '
+'Three, the patient suddenly develops shortness of breath and becomes hypotensive.    His heart rate is 100/min, with a normaI PR and    QRS intervaI.'

var sentencesMatch = string.match(/([\sa-zA-Z\d]){1}.+?[\.!\?]{1}([\s ]+|$)/g);

console.log(sentencesMatch);