Edit: you can combine your total work experience, just make sure at least 1 year is continuous work, regardless of how many employers you worked for.
I̶ s̶u̶p̶p̶o̶s̶e̶ ̶t̶h̶e̶y̶ ̶c̶a̶n̶'̶t̶.̶ ̶I̶n̶ ̶t̶h̶e̶ ̶C̶R̶S̶ ̶p̶o̶i̶n̶t̶s̶ ̶c̶a̶l̶c̶u̶l̶a̶t̶o̶r̶,̶ ̶t̶h̶e̶y̶ ̶a̶s̶k̶ ̶2̶ ̶s̶e̶p̶a̶r̶a̶t̶e̶ ̶q̶u̶e̶s̶t̶i̶o̶n̶s̶ ̶r̶e̶g̶a̶r̶d̶i̶n̶g̶ ̶w̶o̶r̶k̶ ̶e̶x̶p̶e̶r̶i̶e̶n̶c̶e̶ ̶(̶i̶n̶s̶i̶d̶e̶ ̶a̶n̶d̶ ̶o̶u̶t̶s̶i̶d̶e̶ ̶C̶a̶n̶a̶d̶a̶)̶,̶ ̶w̶h̶i̶c̶h̶ ̶m̶e̶a̶n̶s̶ ̶t̶h̶e̶y̶ ̶t̶r̶e̶a̶t̶ ̶t̶h̶e̶m̶ ̶s̶e̶p̶a̶r̶a̶t̶e̶l̶y̶.̶