Because your example exhibits other issues than those you ask about, you may wish to ask questions in Writers stackexchange or in English Language Learners.
(For example, drop the phrase “an extensive training”. For one thing, no article should be used there. For another, it may be better to refer to study, education, or coursework rather than to training, which has non-professional overtones.)
That said, consider forms like the following:
At XYZ, I studied mathematical and statistical topics including measure theory, stochastic processes, time series analysis, and general linear modeling.
At XYZ, my math and statistical coursework included topics in measure theory, stochastic processes, time series analysis, and general linear modeling.