Here Jesus refers to himself in the third person. Alternate translation: "I, the Son of man ... my Father ... Then I" (See: [[rc://en/ta/man/translate/figs-123person]])
"and the angels will be with him." If you translate the first part of the sentence with Jesus speaking in the first person, you can translate this as "and my Father's angels will be with me." (See: [[rc://en/ta/man/translate/figs-123person]])
This is an important title for God that describes the relationship between God and the Son of Man, Jesus. (See: [[rc://en/ta/man/translate/guidelines-sonofgodprinciples]])