Breaks out

Can you please explain what is " breaks out" in this context?

Each of these breaks out into a range of articles

Weebly’s support offer is as good as I have seen in a website builder. It is based around a dedicated help center, featuring a large library of help topics, laid out along eight key subject areas, including e-commerce, building your website, and email marketing. Each of these breaks out into a range of articles focusing on key sub-sections. The e-commerce section, for example, features 12 sub-headings like “getting started with e-commerce”