Complex sentence: Porphyrin also forms a complex with iron in hemoglobin that colors our blood red and transports oxygen, that has been produced by chlorophyll, to the cells of our bodies to burn the fuels that were formed by chlorophyll.
Split into simpler sentences: Porphyrin also forms a complex with iron in hemoglobin that colors our blood red. Hemoglobin transports oxygen, that has been produced by chlorophyll, to the cells of our bodies to burn the fuels that were formed by chlorophyll.