Tannin is a substance that comes from the seeds, stems and skins of grapes.
(Tannin; is; a substance that comes from the seeds, stems and skins of grapes) (a substance; comes; from the seeds, stems and skins of grapes)
Tannin a substance
is comes
a substance that comes from the seeds, stems and skins of grapes
from the seeds, stems and skins of grapes