Translation
and he is divided. And the woman who is unmarried and a virgin, cares for the thing of THE LORD so that she might be holy both in body and in spirit; however, the one who has married cares for the things of the world, how she might please her husband.
Paraphrase
and therefore his allegiances are divided. The woman who is an unmarried virgin is concerned about the things of THE SUPREME RULER so that she can keep herself holy in body and spirit; but the woman who is married is concerned about this world, such as how she can keep her husband happy.
PERSECUTION IS HARDER WHEN MARRIED
The last two verses apply to the marriage relationship in general as well as to the specific challenges that come with persecution, namely that sometimes your persecutors will try to break you by hurting the people you love.