Mormons, can you explain this Book of Mormon verse for me, about the Trinity? 2 Nephi 31:21?

It may seem to support a Trinity doctrine. However, Mormons/LDS concept of God is three distinct individuals but all work together, united as one. A good example that explains the concept is that husband and wife in the bible are two people but become united as one flesh. They are two people but the bible recognizes them as one.