Complex sentence: Additional "Terrier" battalions were raised from volunteers during the early months of the war-2/8th Battalion was formed in September 1914, and 3/8th Battalion was formed in April 1915.
Split into simpler sentences: Additional "Terrier" battalions were raised from volunteers during the early months of the war. The 2/8th Battalion was formed in September 1914 and 3/8th Battalion was formed in April 1915.