Complex sentence: Abu Ghaith first gained attention during the 1990-1991 Iraqi invasion and occupation of Kuwait, his sermons denouncing the occupation and Iraqi President Saddam Hussein gaining him some degree of popularity amongst the Kuwaiti people.
Split into simpler sentences: Abu Ghaith first gained attention during the 1990-1991 Iraqi invasion and occupation of Kuwait. His sermons denouncing the occupation and Iraqi President Saddam Hussein gained him some degree of popularity amongst the Kuwaiti people.