Complex sentence: VT-6 lost 10 of their 14 Devastators, and 10 of "Yorktown's" VT-3's 12 Devastators were shot down with no hits to show for their effort, thanks in part to the abysmal performance of their Mark 13 torpedoes.
Split into simpler sentences: VT-6 lost 10 of their 14 Devastators, and 10 of "Yorktown's" VT-3's. Twelve Devastators were shot down with no hits to show for their effort, thanks in part to the abysmal performance of their Mark 13 torpedoes.