Complex sentence: During this time he became involved in a conflict between Belgian forces and Arab slavers from the East coast of Africa and on 19 April 1893 was placed in command of the artillery attached to an expedition to suppress the slave trade.
Split into simpler sentences: During this time he became involved in a conflict between Belgian forces and Arab slavers from the East coast of Africa. On 19 April 1893 was placed in command of the artillery attached to an expedition to suppress the slave trade.