Simplify the following text for a Grade 10 native English-speaking person.
Original: The rising importance of the Reformed churches , and of Calvin , belongs to the second phase of the Protestant Reformation , when evangelical churches began to form after Luther was excommunicated from the Catholic Church .
Simplified: The rising importance of the Reformed churches and of Calvin belongs to the second phase of the Protestant Reformation . Evangelical churches began to form after Martin Luther was excommunicated from the Catholic Church .