वानरपुङ्गवः chief of vanaras, वाली Vali, त्वया by you, विज्ञातपूर्वश्च is known earlier, वानरः vanara, रामेण by Rama, सङ्ख्ये in a combat, एकेन by only one, शरेण with an arrow, निहतः is killed.

"You know of Vali, chief of the vanaras, in the past. Rama killed him with a single arrow in the combat.