Complex sentence: On 19 June, protesters, many belonging to the Muslim Brotherhood, protested in Cairo's Tahrir Square, angry that the SCAF had taken some of the powers that had formerly belonged to the President.
Split into simpler sentences: On 19 June, protesters, many of them belonging to the Muslim Brotherhood, protested in Cairo's Tahrir Square. They were angry that the SCAF had taken some of the powers that had formerly belonged to the President.