Complex sentence: Jack Dangermond, the president and founder of ESRI, and his wife, Laura, have consistently been two of the top individual contributors to Lewis' campaign fund, giving a combined $13,900 between 2000 and 2005.
Split into simpler sentences: Jack Dangermond, the president and founder of ESRI, and his wife, Laura, have been frequent contributors to Lewis'campaigns. Since 2000, the couple have consistently been two of the top individual contributors, giving a combined $13,900 to Lewis' campaigns between 2000 and 2005.