Easier language for Snippets

spec.md

@@ -164,9 +164,9 @@ An example of a comment header:
 
 #### In-line Snippet comments
 
-If some Copyright and Licensing Information inside of a Commentable File is to
-apply only to a certain Snippet instead of the whole file, SPDX snippet tags
-MUST be used for that Snippet (as defined in [SPDX Specification, Annex
+Sometimes Copyright and Licensing Information only applies to a certain Snippet
+instead of the whole Commentable File. For these cases SPDX snippet tags MUST be
+used for that Snippet (as defined in [SPDX Specification, Annex
 H](https://spdx.github.io/spdx-spec/v2.3/file-tags/#h3-snippet-tags-format)).
 This means that Copyright Notices inside of Snippets MUST be prefixed with
 `SPDX-SnippetCopyrightText`.