In his editing for the 1837 edition, Joseph Smith replaced in the book of Ether a few instances of the noun phrase the Lord with the pronoun he if there was a nearby occurrence of the Lord. For three instances of this change, all in one passage, see under Ether 3:25–27. Joseph was very likely responsible for the change here in Ether 9:35, although the change to he was not marked in 𝓟. The critical text will restore the original the Lord here as well as earlier in Ether 3.
Summary: Restore in Ether 9:35 the original subject the Lord even though it is immediately preceded by the same noun phrase, the Lord.