Complex sentence: In order to make items by glassblowing, players must have a glassblowing pipe and gather seaweed to burn into soda ash and sand, which are heated together in a furnace to make molten glass.
Split into simpler sentences: In order to make items by glassblowing, players must have a glassblowing pipe. They must have seaweed to burn into soda ash and sand, which are heated together in a furnace to make molten glass.