Why was Bengal partitioned ?

Bengal was partitioned only with one intention...to destroy the unity b/w hindus 'n muslims ter. The 'divide 'n rule' policy of the British was executed ter.

The decision of the Partition of Bengal was announced in July 1905 by the Viceroy of India, Lord Curzon. The partition took effect in October 1905 and separated the largely Muslim eastern areas from the largely Hindu western areas. Indians were outraged at what they say as a "divide and rule" policy, while Curzon stressed it would produce administrative efficiency. The partition animated the Hindus and led the Muslims to form their own national organization. Bengal was reunited in 1911.

The Muslim half was joined with Pakistan and later became independent as Bangladesh.

The Hindu half remained part of India.

This is nothing special. Belgium broke away from the Netherlands simply because it was Catholic not Protestant. These splits are common.

to devide bengal community.

you can take it in any way. either u can take it as

a. ease of governance

b. divide and rule policy