Complex sentence: During May, the flow rapidly diminises to 4.62 m³ in June, the waterlevel drops between July and September, the water flow is 1.87 m³ in August.
Split into simpler sentences: During May, the flow rapidly diminises to 4.62 m³/s in June. The waterlevel drops between July and September; the water flow is 1.87 m³/s in August.