Complex sentence: The first attempt to fire charges against submerged targets was with aircraft bombs attached to lanyards which triggered them; a similar idea was a guncotton charge in a lanyarded can; two of these lashed together became known as the "depth charge Type A".
Split into simpler sentences: The first attempt to fire charges against submerged targets was with aircraft bombs attached to lanyards which triggered them. A similar idea was a guncotton charge in a lanyarded can; two of these lashed together became known as the "depth charge Type A".