When the algae die, they decompose and sink to the bottom in a process that depletes the water of oxygen.
(the algae; die; ) (they; decompose; T:When the algae die) (they; sink; to the bottom in a process; T:When the algae die) (a process; depletes; the water of oxygen)
the algae they they a process
die decompose sink depletes
T:When the algae die
to the bottom in a process T:When the algae die
the water of oxygen