When you fill out the artist fields on an album, they are merely text strings. Assinging the artists parses those text strings, separating them by commas, and creates a list of artist names. Once this is done, the album's artist editing page shows a list of the artist names, and the roles they are credited for. The next step is to link those to artist pages. The artist names are automatically compared against the full list of artists to make a guess at the best match. When you link them, those will be linked. There will be artists that have no matches in the database, and those will remain unlinked.
I'm not sure what you did to get the first composer doubled up, but I deleted the extra link.
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