Parenthetic phrases can be ignored without changing the meaning of the sentence.
From the independent.co.uk
Pairs of commas are often used to delimit parenthetic material, forming a parenthetical remark.
From the en.wikipedia.org
Any parenthetic expression should not be italicized unless it is part of the scientific name, as in the case of a subgenus, which is always italicized.
From the en.wikipedia.org
More examples
Qualifying or explaining; placed or as if placed in parentheses; "parenthetical remarks"
(parenthetically) in a parenthetical manner; "he added parenthetically that he would not attend the wedding ceremony"
Parenthetical referencing is a citation style in which in-text citations must be enclosed within parentheses and embedded in the paragraph, as opposed to the footnote style.