Dear Pradhuman,
Thanks for using the Animate It! Plugin.
In order to create nested animations, I generally use a text widget.
I add exit animation using the WordPress Shortcode, and I add the exit animations to the Animate Classes (using the class generator)
Apart from this, I am afraid if its won't be easy if you are using some other type of widget (Recent Posts, Breadcrumbs etc.)
Please let me know what is the case with you. Also, if possible, please share the link to the page where you are adding this animation.