Complex sentence: After the defeat of the Goa'uld, Chulak became a major stronghold for the Free Jaffa Nation, but after their victory at the Battle of P3Y-229 the Ori forces moved on to Chulak, where they took control after a ferocious battle.
Split into simpler sentences: After the defeat of the Goa'uld, Chulak became a major stronghold for the Free Jaffa Nation. But after their victory at the Battle of P3Y-229, the Ori forces moved on to Chulak, where they took control after a ferocious battle.