kathitas tasya sambhavaḥ
śiśupālaḥ — Śiśupāla; sutaḥ — the son; tasyāḥ — of her (Śrutaśravā); kathitaḥ — already described (in the Seventh Canto); tasya — his; sambhavaḥ — birth; devabhāgasya — from Devabhāga, a brother of Vasudeva’s; kaṁsāyām — in the womb of Kaṁsā, his wife; citraketu — Citraketu; bṛhadbalau — and Bṛhadbala.
The son of Śrutaśravā was Śiśupāla, whose birth has already been described [in the Seventh Canto of Śrīmad-Bhāgavatam]. Vasudeva’s brother named Devabhāga had two sons born of his wife, Kaṁsā. These two sons were Citraketu and Bṛhadbala.