Complex sentence: They compete with their Award-Winning vehicle named "Tigergen II" in the Shell Eco-Marathon and in 2011 achieved 14.2mi/kWh or the gasoline equivalent of 490 miles per gallon which won them the 1st place prize for the Hydrogen category in the Urban Concept division.
Split into simpler sentences: They compete with their Award-Winning vehicle named "Tigergen II" in the Shell Eco-Marathon. In the 2011 competition they achieved 14.2mi/kWh or the gasoline equivalent of 490 miles per gallon which won them the 1st place prize for the Hydrogen category in the Urban Concept division.