Complex sentence: At 912 ° C the crystal structure again becomes bcc as α-iron, or ferrite, is formed, and at 770 ° C (the Curie point, T c) iron becomes magnetic.
Split into simpler sentences: At 912 ° C and below, the crystal structure again becomes the bcc α-iron allotrope, or ferrite. Finally, at 770 ° C (the Curie point, T c) iron becomes magnetic.