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CJam, 16 bytes

l_,),.\'</Wf%'<*

Try it online!

A port of my Retina answer.

Explanation

l    e# Read input.
_,   e# Duplicate, get length N.
),   e# Get range [0 1 2 ... N].
.\   e# Riffle input string into this range.
'</  e# Split around '<'.
Wf%  e# Reverse each chunk.
'<*  e# Join with '<'.