Complex sentence: In 1789, he signed on as a volunteer in the 10e régiment de chasseur à cheval, with whom he distinguished himself at the Battle of Valmy in 1792 and participated in the of 1795.
Split into simpler sentences: In 1789, he signed on as a volunteer in the 10e régiment de chasseur à cheval. It was with the 10e régiment de chasseur à cheval that he distinguished himself at the Battle of Valmy in 1792 and participated in the of 1795.