Complex sentence: Homeschooled children are isolated from the outside world, eventually making them socially and educationally handicapped.Unless of course you sign them up for a homeschool group in which they'll make friends.
Split into simpler sentences: Homeschooled children are isolated from the outside world, eventually making them socially and educationally handicapped. Unless, of course, one signs them up for a homeschool group in which they'll make friends.