Yes, you can restore a deleted page depending on the situation:

If you cleared the page but was able to save the page, you can recover it under Page History, then select the version you need to recover. 

If you reduced your total number of pages: Simply increase the page count again from Manage> Manage Account, and the deleted page will return.

For future use: We recommend saving important pages as templates. To do this, click the arrow next to Save, then select Save as Template. This way, you can easily reinsert the page whenever needed.