Simplify the following text for a Grade 9 native English-speaking person.
Original: Barium carbonate , the other ore of barium , is dissolved in hydrochloric acid to make barium chloride and carbon dioxide .
Simplified: Because barite is so insoluble , it can not be used directly for the preparation of other barium compounds , or barium metal . Instead , the ore is heated with carbon to reduce it to barium sulfide :