Complex sentence: Inside Rusty, Clara convinces the Doctor to try to reawaken the good side of the Dalek, and they split up, with Clara and Journey heading to reawaken memories currently being suppressed by the Dalek's past, and the Doctor heading to the Dalek's consciousness.
Split into simpler sentences: Inside Rusty, Clara convinces the Doctor to try to reawaken the good side of the Dalek. They split up, with Clara and Journey heading to reawaken memories of the Dalek's pastcurrently being suppressed, and the Doctor heading to the Dalek's consciousness.