in the test voew of your post content will split the page.
If you want more control over how the page splits, there's the Advanced Content Pagination plugin that allows you to use shortcodesinside your post to decided where the page will break, as well as adding options for the display of page controls.
Advanced Post Pagination - WordPress Plugins
If you don't want to manually split things up, there's the Automatically Paginate Posts plugin, which lets you specify a rough word count and it will split post up for you.
Automatically Paginate Posts - WordPress Plugins