They lay the eggs and attach them with twigs, grass stems and leaves that have decayed on the bottom floor of the pond.
(They; lay; the eggs) (They; attach; them) (grass; stems; ) (grass; leaves; that have decayed on the bottom floor of the pond) Context(grass leaves,List([46, 68))):(that; have decayed; L:on the bottom floor of the pond)
grass leaves,List([46, 68))
They They grass grass that
lay attach stems leaves have decayed
the eggs
them
that have decayed on the bottom floor of the pond
L:on the bottom floor of the pond