Original sentence: Media Matters for America (or MMfA) is a 501(c)(3) non-profit organization founded in 2004 by liberal (formerly conservative) journalist and author David Brock; it is an organization that hosts a website featuring watchdog journalism
Edited sentence: Media Matters for America (or MMfA) is a 501(c)(3) non-profit organization founded in 2004 by supposed liberal (formerly conservative) journalist and author David Brock; it is an organization that hosts a website featuring watchdog journalism