What is a good way of putting in your resume that you are juggling the responsibilities of three roles in your position?

I am currently looking for new positions because I am completely burnt out from picking up responsibilities of coworkers who get paid the same as me to do less

Currently, my resume looks roughly like

Senior Position A (June 2020 - Present)-Responsibility #1-Responsibility #2-Responsibility #3-Continued to manage responsibilities of Position A and Position B

Position A (September 2018-May2020)-Responsibility #1-Responsibility #2-Responsibility #3-Managed responsibilities of Senior Position A since January 2020

Additional position B responsibilities (December 2019 - Present)-Responsibility #1-Responsibility #2-Responsibility #3

I feel like this makes my resume very long which is my main concern...like this alone takes up 3/4 of the page because I keep having to mention so many different responsibilities. Any thoughts or tips? I don't know if this is the appropriate way to handle such a situation like mine.

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