Simplify the following text for a Grade 12 native English-speaking person.
Original: Pentecostalism is theologically and historically close to the charismatic movement as it significantly influenced that movement , and sometimes the terms Pentecostal and charismatic are used interchangeably .
Simplified: Pentecostalism is similar to the Charismatic movement , but developed earlier and separated from the mainstream church . Charismatic Christians , at least in the early days of the movement , tended to remain in their respective denominations .