Военачальников

21 Наконе́ц Иродиа́де представился подходящий слу́чай.

21 [Finally, At Last] Herodias представился подходящий [case, event, happening].

И́род в день своего́ рожде́ния устро́ил пир для свои́х приближенных,

Herod [at, in, of, on] day [his, yours] [birth, birthday, births, childbirth] [arranged, organized] [feast, banquet] for their [close associates, servants],

военачальников и са́мых уважа́емых люде́й Галиле́и.

военачальников and most dear [human, of people, people] Galilee.

But an opportunity came when Herod on his birthday gave a banquet for his nobles and military commanders and the leading men of Galilee.
Mark 6:21 ESV

And when a convenient day was come,
that Herod on his birthday made a supper to his lords,
high captains,
and chief estates of Galilee;
Mark 6:21 KJV