Simplify the following text for a Grade 10 native English-speaking person.
Original: The legend is linked to an idea in the Book of Revelation ( 3:12 and 21:2 ) describing a Second Coming , wherein Jesus establishes a new Jerusalem .
Simplified: The poem connects this legend to an idea in the Book of Revelation ( 3:12 and 21:2 ) describing a Second Coming in which Jesus builds a new Jerusalem .