Complex sentence: The longest war: the Iran-Iraq military conflict, page 225 while Khomeini called on Saudis to overthrow the House of Saud to avenge the the pilgrims' deaths.
Split into simpler sentences: The longest war: the Iran-Iraq military conflict, page 225. On the same day, the Iranian leader Khomeini called on Saudis to overthrow the House of Saud to avenge the the pilgrims' deaths.