Complex sentence: In the following years, it was extended to encompass the three Commonwealth realms of Canada, Australia and New Zealand, while so-called "third parties" such as West Germany, the Phillipines, and several Scandinavian countries joined the UKUSA community.
Split into simpler sentences: In the following years, it was extended to encompass the three Commonwealth realms of Canada, Australia and New Zealand. Other countries, know as "third parties", such as West Germany, the Philippines and several Scandinavian countries also joined the UKUSA community.