Complex sentence: Webb has been an advocate for grassroots Muslim activism to promote social change, strongly advocating for an articulation of American Islam that is authentically Islamic, with leaders that are acutely aware of the issues facing Muslim Americans.
Split into simpler sentences: Webb has been an advocate for grassroots Muslim activism to promote social change. He has also strongly advocated for an articulation of American Islam that is authentically Islamic with leaders that are acutely aware of the issues facing Muslim Americans.