telling two discrete period of work experience for same company in employment reference

2017-06-15 12:10:11

What is the best way to addressing two discrete work experience in employment reference letter?

Is this sentence correct?

This letter will confirm that Mr. John holder of National ID No. 4522

worked for the Microsoft company from 24 June 2013 till 21 August

2015, and also from 1 March 2016 till 1 Jan 2017.