Complex sentence: Although a huge part of the cost of this bridge was done by the business class from Monterrey, they were aware that the Santa Catarina River is affected by overflowing water from saturated rain caused by hurricanes.
Split into simpler sentences: Although a huge part of the cost of this bridge was done by the business class from Monterrey. They were aware that the Santa Catarina River is affected by overflowing water from saturated rain caused by hurricanes.