Original sentence: Following the 2009 Iranian presidential election, protests against alleged electoral fraud  and in support of opposition candidate Mir-Hossein Mousavi are currently underway in Tehran and other major cities in Iran and around the world.In response, other groups of people have rallied in Tehran to support the victory of Mahmoud Ahmadinejad
Edited sentence: Following the 2009 Iranian presidential election, massive protests against alleged electoral fraud  and in support of opposition candidate Mir-Hossein Mousavi are currently underway in Tehran and other major cities in Iran and around the world.In response, smaller groups of people have rallied in Tehran to support the victory of Mahmoud Ahmadinejad