अथा and now, किञ्चित् even a bit, अदृष्टंवा not seen, तत् that, भूयः you may do, द्रष्टुम् see, अर्हथः ought to see, ना or else, विभीषणः Vibheeshana कात्स्नर्येन in totality, भूयः you may, सन्दर्शयिष्यति will show you.

"If you have not seen even a bit, you ought to see. Or else Vibheeshana will show you the total army."