The original texts are quite enigmatic and difficult to read or translate, but I will try to explain the chief points in plain English, hopefully without losing too much of the original content. In his cosmology, Empedocles came to the conclusion that motion and change actually exist and that at the same time reality is fundamentally changeless, allowing the validity of both Heraclitus' and Parmenides' doctrines and combining them in a new and surprising conceptual connection. The Yin and Yang principles represent two opposite universal powers, attributed male and female, that govern all existing things in some form of coexistence. Empedocles said that the history of the universe is cyclic and eternal. Then the sphere dissolves under the rising power of Strife and the world is established in a series of stages until it reaches a state of complete dissolution.
History then reverses itself, and the universe gradually returns to the state of the sphere.
This cosmic cycle rolls on repeatedly, without beginning and without end. And these never cease their continual change, now coming by Love all into one, now again all being carried apart by the hatred of Strife. And in addition to them nothing comes into being or ceases. For if they were continually being destroyed they would no longer exist. But these themselves exist, and passing through one another they become different at different times - and are ever and always the same.