The free version of YITH WooCommerce Multi-step Checkout allows you to enable checkout structure in your shop and split this process in more than one step.
Click on YIT Plugins > Multi-setp Checkout to enable this new checkout for your users.
From this moment on, Checkout page of your shop will be organissed in separated steps as shown in the following image.
You will be able to restore standard WooCommerce one-page checkout by simply disabling the plugin.