en_tn/dan/07/15.md

my spirit was grieved ... my mind troubled me

These two phrases show two different aspects of how Daniel felt. They are next to each other to make both feelings strengthen one another. (See: rc://en/ta/man/translate/figs-parallelism)

one of them standing there

This is one of the heavenly beings who were standing before God's throne (UDB). Possible meanings 1) these are angels, spirits who serve God 2) these are people who have died and are now in heaven.

to show me

"to tell me" (UDB) or "to explain to me"

these things

AT: "the things I had seen"