kṛṣṇa - Lord Kṛṣṇa; yadi - if; pṛthivīte - on the earth; karena - makes; avatāra - incarnation; prathame - first; karena - makes; guru-vargera - of the group of respectable predecessors; sañcāra - the advent.

Whenever Śrī Kṛṣṇa desires to manifest His incarnation on earth, first He creates the incarnations of His respectable predecessors.