Complex sentence: On 20 May 1693, Alexander became an Ensign in the Earl of Bath's Regiment of Foot, and was commissioned in 1698, being promoted to Lieutenant-Colonel in 1703.
Split into simpler sentences: On 20 May 1693, Alexander became an Ensign in the Earl of Bath's Regiment of Foot. He was commissioned in 1698, and promoted to Lieutenant-Colonel in 1703.