Complex sentence: Bilawal was admitted to Aitchison College, Lahore, but due to security threats he moved to Karachi Grammar School and later attended Froebel's International School in Islamabad.
Split into simpler sentences: Bilawal was admitted to Aitchison College, Lahore, but due to security problems he could not continue. He also attended Froebel's International School in Islamabad.