Original sentence: Dinah is a strong leader and strategic thinker — qualities recognized by the other superheroes, who have selected her as the Chairwoman of the JLA (John Stewart recognised Black Canary as "tactically the best chairperson the Justice League has ever had", placing her strategic skills next to Batman, with charisma comparable to that of Superman)
Edited sentence: Dinah is a strong leader and strategic thinker — qualities recognized by the other superheroes, who have selected her as the Chairwoman of the JLA (John Stewart speculated that Black Canary is "tactically the best chairperson the Justice League has ever had", placing her strategic skills next to Batman, with charisma comparable to that of Superman)