Complex sentence: Adding to these other affluent rivers collect residual waters from other major cities and deposit an approximate of 330 tons of residual waste into the river, by the time it gets to Yumbo the river has no oxygen.
Split into simpler sentences: Adding to these other affluent rivers collect residual waters from other major cities and deposit an approximate of 330 tons of residual waste into the river. By the time it gets to Yumbo the river has no oxygen.