Расположившись

40 Лю́ди возлегли́,

40 People [reclined, sat down, they lay down],

расположившись гру́ппами по сто и по пятьдеся́т челове́к.

расположившись groups [along, by, in, on, to, unto] [hundred, one hundred] and [along, by, in, on, to, unto] fifty [man, human, person].

So they sat down in groups,
by hundreds and by fifties.
Mark 6:40 ESV

And they sat down in ranks,
by hundreds,
and by fifties.
Mark 6:40 KJV