When describing an experiment (inside a thesis paper), I want to explain that we took a sample and did two things to it, but not together, rather as two separate experiments.
One way to write it is :
We took the sample and either did X to it, or did Y to it.
Another way is:
We took the sample and did X to it, and separately did Y to it.
Frankly I'm not happy with either forms. What's a good way to write this?