This action can be only used on definite integrals.

Please take a look at the screenshots below to see how this action works. Note that to solve the example below we are not required to use "Split integral" action.  

Now the split integrals can be computed separately by using "Evaluate: Integral" action. 

Hope you have found this helpful. Please note that you can contact us here in case you have questions or concerns using this action.