Complex sentence: Certain Jewish thinkers, such as Maimonides, believed that concubines are strictly reserved for kings, and thus that a commoner may not have a concubine; indeed, such thinkers argued that commoners may not engage in any type of sexual relations outside of a marriage.
Split into simpler sentences: Certain Jewish thinkers, such as Maimonides, believed that concubines were strictly reserved for kings, and thus that a commoner may not have a concubine. Indeed, such thinkers argued that commoners may not engage in any type of sexual relations outside of a marriage.