Complex sentence: This incarnating aspect or dimension of the human being, spirit-soul, or the'psychic being' or chaitya purusha, is the part that reincarnates and is of the energetic quality of "saccidānanda".
Split into simpler sentences: This incarnating aspect or dimension of the human being, the spirit-soul, or the'psychic being' or chaitya purusha, is the staple essence that reincarnates from life to life. This essence is of the energetic quality of "saccidānanda".