Complex sentence: "Disavowing" refers to removing a user's access to the ILLiad web interface, automatically cancels all open requests made in the user's name, and sends an e-mail to user stating that they have been disavowed.
Split into simpler sentences: Disavowing refers to removing an user's access to the ILLiad web interface. Disavowing then sends an e-mail to user stating that they have been disavowed.