Simplify the following text for a Grade 9 native English-speaking person.
Original: Historically , Pascal 's Wager was groundbreaking as it had charted new territory in probability theory , was one of the first attempts to make use of the concept of infinity , marked the first formal use of decision theory , and anticipated the future philosophies of pragmatism and voluntarism .
Simplified: It is also one of the first tries to use the concept of infinity , and the first use of decision theory . It was important for other philosophers who developed the ideas of pragmatism and voluntarism .