Original: Concubines have limited rights of support from the man, and their offspring are publicly acknowledged as the man's children, albeit usually of lower status than children born by the official wife or wives; these legal rights distinguish a concubine from a mistress.
Simplified: Concubines have only limited rights of support from the man, and their children have lower status than children born by the official wife or wives; these legal rights distinguish a concubine from a mistress.