Simplify the following text for a Grade 8 native English-speaking person.
Original: The core Christian belief is that through belief in and acceptance of the death and resurrection of Jesus , sinful humans can be reconciled to God and thereby are offered salvation and the promise of eternal life .
Simplified: The main Christian belief is that , through the death and resurrection of Jesus , sinful humans can be reconciled to God . Through this , they believe they are given salvation and the promise of eternal life .