Complex sentence: The rivers of the La Plata Basin carry an estimated of silt into the Río de la Plata each year, where the muddy waters are stirred up by winds and tides; the shipping route from the Atlantic to Buenos Aires is kept open by continual dredging.
Split into simpler sentences: The rivers of the La Plata Basin carry an estimated of silt into the Río de la Plata each year, where the muddy waters are stirred up by winds and tides. The shipping route from the Atlantic to Buenos Aires is kept open by continual dredging.