Complex sentence: One of them decidedly supports the need to disguise the bride as a man in order to help the bridegroom consummate the marriage, so unaccustomed were men to women looks at the time of their first intercourse.
Split into simpler sentences: One of them decidedly supports the need to disguise the bride as a man in order to help the bridegroom consummate the marriage. So unaccustomed were men to women looks at the time of their first intercourse.