Welcome to callback hell.

callbackhell.js

$('.title')
    .typetype("Hello there.", { e: 0.04, t: 100,})
    .backspace(
        12,
        { 
            t: 75,
            callback: function() {
                $('.title')
                    .delay(1122)
                    .typetype("I am &!", { e: 0.04, t: 100,})
                    .backspace(
                        6,
                        { 
                            t: 75,
                            callback: function() {
                                $('.subtitle')
                                    .delay(1122)
                                    .typetype("I'm also known as bnb, bang, bitnb, bitandbang, and Tierney Coren.", { e: 0.04, t: 100,})
                                    .backspace(
                                        6,
                                        { 
                                            t: 75,
                                            callback: function() {
                                                // and one or two further.
                                            }
                                        }
                                    );
                                
                            }
                        }
                    );
            }
        }
    );