ٱلَّذِى كَذَّبَ وَتَوَلَّىٰ
Sentence structure
ٱلَّذِى describes ٱلْأَشْقَى. كَذَّبَ and coordinated وَتَوَلَّىٰ form its relative clause with understood subject.
Ayah summary
He is the one who rejected the truth and turned away.
ٱلَّذِى — The one who
Grammar: A masculine-singular relative noun describing ٱلْأَشْقَى; its relative clause follows.
كَذَّبَ — denied
Grammar: A Form II third-person masculine-singular perfect in the relative clause with understood subject هُوَ.
وَتَوَلَّىٰ — and turned away
Grammar: وَ coordinates; تَوَلَّىٰ is a Form V perfect with understood subject هُوَ.