Simplify the following text for a Grade 14 native English-speaking person.
Original: Before the conquest by Arabian Muslims reached Lebanon , which resulted in the Arabization of both those who would become Islamized and those that would remain non-Islamized , the Lebanese people , including Maronites , spoke a dialect of Aramaic , but have been Arabic-speaking since at least the 15th century .
Simplified: Before the conquest by Arabian Muslims reached Lebanon , the Lebanese people including those who would become Muslim and the majority who would remain Christian , spoke a dialect of Aramaic .