[verb (dictionary form)] + かたわら
[noun] + の + かたわら
かたわら means "alongside": someone has a main occupation and keeps up a second activity next to it, over months or years. It follows a verb in the dictionary form, or a noun with の. The first half is the main role and the second half the extra one.
かたわら is written Japanese: biographies, news articles, the introduction of a speaker or an author. In conversation you say きごう〜をしながら or きごう〜のほかに.
As an ordinary noun, かたわら (傍ら) also means "beside": かれ彼のかたわらにすわる座る, to sit beside him.