( So ( again ( we ( ( ( ( ( form ( ( the ( sp ( 3 orbitals ) ) ) ( from ( the ( 2s ( and ( 2p orbitals ) ) ) ) ) ) ) and ) then ) ( ( ( populate them ) ( with ( the ( 5 ( valence electrons ) ) ) ) ) ( that ( nitrogen has ) ) ) ) . ) ) ) )
(ROOT (S (IN So) (ADVP (RB again)) (NP (PRP we)) (VP (VP (VBP form) (NP (NP (DT the) (JJ sp) (CD 3) (NNS orbitals)) (PP (IN from) (NP (DT the) (JJ 2s) (CC and) (JJ 2p) (NNS orbitals))))) (CC and) (RB then) (VP (VB populate) (NP (PRP them)) (PP (IN with) (NP (DT the) (CD 5) (JJ valence) (NNS electrons))) (SBAR (IN that) (S (NP (NN nitrogen)) (VP (VBZ has)))))) (. .)))
So again we form the sp 3 orbitals from the 2s and 2p orbitals and then populate them with the 5 valence  electrons that nitrogen has.
(ROOT (S (NP (NNP Nitrogen)) (VP (VBZ has) (NP (CD 5) (JJ valence) (NNS electrons))) (. .)))