Complex sentence: However, there are several reasons why marriage may exert a greater health impact than other relationships, even other cohabiting relationships: married couples spend time together during a wide variety of activities, such as eating, leisure, housekeeping, child-care and sleep.
Split into simpler sentences: However, there are several reasons why marriage may exert a greater health impact than non-cohabiting relationships. Married couples spend time together during a wide variety of activities, such as eating, leisure, housekeeping, child-care and sleep.