Complex sentence: Zerelda was tormented by the thought that someone would come and take him so she had him buried an extra few feet down than the standard six, for an extra few coins visitors were allowed to scoop up the "authentic" pebbles from the grave.
Split into simpler sentences: Zerelda was tormented by the thought that someone would come and take him so she had him buried an extra few feet down than the standard six. For an extra few coins visitors were allowed to scoop up the "authentic" pebbles from the grave.