Complex sentence: Prishiboro had an older brother, who tricked Prishiboro into killing his elephant wife and later into eating his elephant wife's breast meat, thus causing the dead wife's herd to come and try to kill Prishiboro.
Split into simpler sentences: Prishiboro had an older brother, who tricked Prishiboro into killing his elephant wife and later into eating his elephant wife's breast meat. Causing the dead wife's herd to come and try to kill Prishiboro.