Complex sentence: Malabar District was considered too large for effective administration, so it was divided into the districts of Kozhikode, Kannur, and Palakkad on 1 January 1957.
Split into simpler sentences: Malabar District was considered too large for effective administration. It was divided into the districts of Kozhikode, Kannur, and Palakkad on 1 January 1957.