Complex sentence: Giratina went back to the reverse world followed by Ash and Shaymin to stop Zero and they succeded in driving Zero out of the reverse world where Zero loses control of the ship while it glides uncontrollably along the lake.
Split into simpler sentences: Giratina went back to the reverse world followed by Ash and Shaymin to stop Zero. They succeded in driving Zero out of the reverse world where Zero loses control of the ship while it glides uncontrollably along the lake.