en_tn/neh/03/29.md

repaired the section ... east gate, repaired

These phrases refer to repairing the wall. Alternate translation: "repaired the section of the wall ... east gate, repaired the wall" (See: rc://en/ta/man/jit/figs-explicit)

After them

"Next to them"

Zadok ... Immer ... Shemaiah ... Shecaniah

These are the names of men. (See: rc://en/ta/man/jit/translate-names)

Shemaiah son of Shecaniah, the keeper of the east gate

Shemaiah was the keeper of the east gate, not Shecaniah.

the keeper of the east gate

"the person who looked after the east gate" or "the person who opened and closed the east gate"