I like to split this kind of thing to more than one conditional, as it makes it easier for me to read.
if( !( in_category( 'videos' ) || post_is_in_descendant_category( 9 ) ) ) {
if( get_the_author_meta( 'ID' ) != 3 ) {
}
}
Given, it’s a bit more code, but that’s the way it reads best to my eyes.
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