Complex sentence: In August 1914, the Ilya Muromets was introduced into the Imperial Russian Air Force and on 10 December 1914, the Russians formed their first 10-bomber squadron, slowly increasing the number to 20 by the summer of 1916.
Split into simpler sentences: In August 1914, the Ilya Muromets was adopted by the Imperial Russian Air Force. On 10 December 1914, the Russians formed their first 10-bomber squadron, slowly increasing the number to 20 by the summer of 1916.