en_tn/mat/24/31.md

He will send his angels with a great sound of a trumpet

"He will have a trumpet sounded and send his angels" or "He will have an angel blow a trumpet, and he will send his angels"

He ... his

Jesus is speaking about himself in the third person. (See: rc://en/ta/man/jit/figs-123person)

they will gather

"his angels will gather"

his elect

These are the people whom the Son of Man has chosen.

from the four winds, from one end of the sky to the other

Both of these mean the same thing. They are idioms that mean "from everywhere." Alternate translation: "from all over the world" (See: rc://en/ta/man/jit/figs-parallelism and rc://en/ta/man/jit/figs-idiom)