Complex sentence: In Denmark, he became Second Lieutenant in the Life Guards in 1683 and accompanied the battalion "Hjaelpetropperne" and Nederlanderne 1689-1691 to Ireland.
Split into simpler sentences: In Denmark, he became Second Lieutenant in the Life Guards in 1683. Accompanied the battalion "Hjaelpetropperne" and Nederlanderne from 1689 to 1691 to Ireland.