Simplify the following text for a Grade 10 native English-speaking person.
Original: After the arrival of the Europeans , many Iroquois became Christians , among them Kateri Tekakwitha , a young woman of Mohawk-Algonkin parents .
Simplified: After the the Europeans arrived , many Iroquois became Christians , among them Kateri Tekakwitha , a young woman of Mohawk-Algonkin parents .