Complex sentence: In 2009, the Junge Landsmannschaft Ostdeutschland youth group of the NPD organised a march but urrounded by policemen, the 6,000 neo-Nazis were not allowed to leave their meeting point.
Split into simpler sentences: In 2009, a march was organised by Junge Landsmannschaft Ostdeutschland, youth group of the NPD. Surrounded by policemen, 6,000 neo-Nazis were not allowed to leave their meeting point.