Complex sentence: OA, OC, AB, BC, CD, DA, such that the length of OA is equal to the length of OC, and the lengths of AB, BC, CD, and DA are all equal.
Split into simpler sentences: OA, OC, AB, BC, CD, DA. The length of OA is equal to the length of OC, and the lengths of AB, BC, CD, and DA are all equal.