Identify the thesis statement as unified or not unified. private retirement systems have grown in the past twenty years because they provide extensive benefits to self-employed people. unified or not

The thesis statement "Private retirement systems have grown in the past twenty years because they provide extensive benefits to self-employed people." is an example of a unified statement. 
Unified statement although looms from the rest of the text, it still clearly relates to other parts of a paragraph. 

Just find a long word in the book.