Original sentence: He scored two victories in April 1917, both on April 13, when he downed (along with Lieutenant Donat Makeenok and Ensign Vasili Yanchenko) two  Hansa-Brandenburg C
Edited sentence: He scored two victories in April 1917, both on April 13, when he downed (along with Lieutenant Donat Makeenok and Ensign Vasili Yanchenko, the latter being Russia's second highest-scoring ace of the war</ref>) two  Hansa-Brandenburg C