Complex sentence: Around August 2012 two greenling were caught close to the Fukushima shore, they contained more than 25,000 becquerels of cesium-137 per kilogram of fish, the highest cesium levels found in fish since the disaster and 250 times the government's safety limit.
Split into simpler sentences: Around August 2012 two greenling were caught close to the Fukushima shore. They contained more than 25,000 becquerels of cesium-137 per kilogram of fish, the highest cesium levels found in fish since the disaster and 250 times the government's safety limit.