Complex sentence: These areas with their (relatively) low socioeconomic standard and high unemployment led to segregation, and at the same time the rate of foreigner related crimes were reported as being at a significant for Swedish standards but nothing in comparison with the rest of the world.
Split into simpler sentences: These areas with their (relatively) low socioeconomic standard and high unemployment led to segregation. At the same time the rate of foreigner-related crimes were reported as being at a significant level for Swedish standards but low in comparison with the rest of the world.