The Holy Trinity does not compromise the oneness of God. The one God is three Persons: Father, Son, and Holy Spirit. All three are God, not three parts of God.
The Incarnation means that the second person of the Holy Trinity, who is called the “Word” of God, became flesh (added our human nature to his divine nature) and was called Jesus.
“I and the Father are one” (John 10:30)
I take that to mean that He, as the Son of God, is of His father and His Father’s Word- not that they are the same. They are the same in the Word, but God is still the One above all.