✨ ベストアンサー ✨
S: They
V: believed
O: that
(after death)
S: they
V: traveled
(to the afterlife,)
↑
where
S: they
V: were reborn
and
V: lived (forever)
彼らは、彼らが死んだ後には死後の世界に行き、そこで再び命を得て永遠に生きる、と信じていました。
But
S: this
V: could (only) take
O: place
※take placeは「起こる」という熟語
if
S: their bodies
V: were preserved
ありがとうございます!