You don’t need an action, but a filter, because you want to do something with the result of a function. The filter is, predictably, called category_description
In this way (didn’t test it though):
function wpse236947_trim_category_desc ( $desc, $cat_id ) {
// do your thing
return $desc;
}
add_filter( 'category_description', 'wpse236947_trim_category_desc' );
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