Complex sentence: The ethnic mix has resulted in political parties being affiliated with a specific group; the Muttahida Qaumi Movement (MQM) was founded for the political interests of the Muhajir people.
Split into simpler sentences: The ethnic mix has resulted in political parties being affiliated with specific communities. For example, the Muttahida Qaumi Movement (MQM) was founded for the political interests of the Muhajir people.