Complex sentence: On March 11,1917 Singh was considered fit enough to rejoin active combat and was sent to the Central Ontario Regimental Depot and waited to be sent to France again, however he developed severe tuberculosis and was sent back to Canada in May.
Split into simpler sentences: On March 11,1917, Singh was considered fit enough to rejoin active combat and was sent to the Central Ontario Regimental Depot and waited to be sent to France again. However, he developed severe tuberculosis and was sent back to Canada in May.