Complex sentence: This homeschool co-op/support group is the largest of its size and holds an annual Eastern Panhandle conference open to all homeschoolers in the Eastern Panhandle and D.C. Metropolitan area.
Split into simpler sentences: This homeschool co-op/support group is the largest of its size. It holds an annual Eastern Panhandle conference open to all homeschoolers in the Eastern Panhandle and D.C. Metropolitan area.