Simplify the following text for a Grade 7 native English-speaking person.
Original: The Songhai Empire 's eventual collapse was largely the result of a Moroccan invasion in 1591 , under the command of Judar Pasha . The fall of the Songhai Empire marked the end of the region 's role as a trading crossroads .
Simplified: The Songhai Empire became smaller after a Moroccan attack in 1591 .