JSFiddle - React, Tailwind, and code Playground

JavaScript

var s="Ann M Martin - Baby sitters Club - Baby sitters Little Sister - Super Special 04 - Karen, Hannie and Nancy - The Three Musketeers.doc";
console.log('s='+s);
    var p = s.split(' - ');
    var r = '';
    var i = 0;
    p.forEach(function(e){
      switch(i) {
        case 0: r += e; break;
        case 1: case p.length - 1: r += ' - ' + e; break;
        default: r += '- ' + e;
      }
      i++;
    });
console.log('r='+r);