Complex sentence: Connie is also the first human that Steven fused with: in "Alone Together", "We Need To Talk", "Beach City Drift", and "Crack the Whip", they fused together to form Stevonnie.
Split into simpler sentences: Connie is also the first human that Steven fused with. In "Alone Together", "We Need To Talk", and "Beach City Drift", they fused together to form Stevonnie.