Complex sentence: Dennis Travale is the second mayor of Norfolk County, Ontario, Canada whose tenure has witness a major worldwide economic meltdown starting on September 2008 along with wide scale development of land alongside Simcoe's Queensway Street.
Split into simpler sentences: Dennis Travale is the second mayor of Norfolk County, Ontario, Canada whose tenure has witness a major worldwide economic meltdown starting on September 2008. One of his notable accomplishments is a wide-scale development of land alongside Simcoe's Queensway Street.