If you want to clear the website history on your iPad then you can do this easily from Safari settings, you can clear Safari history, Cookies and Cache files. Follow this guide to clear Safari history
On your iPad home screen tap Settings icon
Tap Safari to view its settings, here you can clear Safari History, Cookies and Cache as well
Clear History : using this option your can clear Safari history of websites that you have been visited.
Clear Cookies : you can clear Safari Cookies a small piece of file called that contains personalize information like website settings, login information, etc.
Clear Cache : clear Safari cache content that is stored on your device to load website faster when you visit it next time.