Complex sentence: The Försvarets radioanstalt (FRA) of Sweden (codenamed Sardines) has been working extensively with the NSA, and it has granted the "Five Eyes" with access to underwater cables in the Baltic Sea.
Split into simpler sentences: The Försvarets radioanstalt (FRA) of Sweden (codenamed Sardines) has been working extensively with the NSA. It has given the "Five Eyes" access to underwater cables in the Baltic Sea.