Complex sentence: It can be further refined to make "red rossler" by adding bloodroot, and other ingredients such as currants, to produce a somewhat bitter and astringent decoction used as digestif as well as a remedy for diarrhea or abdominal pain.
Split into simpler sentences: It can be further refined to make "red rossler" by adding bloodroot, and other ingredients such as currants, to produce a somewhat bitter and astringent decoction. It is used as digestif as well as a remedy for diarrhea or abdominal pain.