#!/bin/bash
line='Value1|Value2|Value3|Value4@@ Value5|Value6|Value7|Value8@@ Value9|etc...'
eol=$'\n'
line="${line//@@ /$eol}"
echo "$line"
IyEvYmluL2Jhc2gKCmxpbmU9J1ZhbHVlMXxWYWx1ZTJ8VmFsdWUzfFZhbHVlNEBAIFZhbHVlNXxWYWx1ZTZ8VmFsdWU3fFZhbHVlOEBAIFZhbHVlOXxldGMuLi4nCmVvbD0kJ1xuJwpsaW5lPSIke2xpbmUvL0BAIC8kZW9sfSIKCmVjaG8gIiRsaW5lIg==