Here the typesetter for the 1858 Wright edition accidentally skipped the words “the Lord their God and they began to remember”; his eye skipped from the first to the second instance of “and they began to remember”, thus omitting that second instance and the immediately preceding “the Lord their God”. The first two RLDS editions followed the shortened reading, but the third RLDS edition (in 1908) restored the correct longer reading.
Summary: Maintain in Helaman 11:7 the original longer reading, “and they began to remember the Lord their God and they began to remember the words of Nephi”.