Complex sentence: Ferdinand II, Holy Roman Emperor issues the Edict of Restitution, under which all Catholic properties lost to Protestantism since 1552 are to be restored and only Catholics and Lutherans (not Calvinists, Hussites or other sects) are to be allowed to practice their faith.
Split into simpler sentences: Ferdinand II, Holy Roman Emperor issues the Edict of Restitution, ordering all Catholic properties lost to Protestantism since 1552 are to be restored. The Edict further provides that Catholics and Lutherans (but not Calvinists, Hussites or members of other sects) are to be allowed to practice their faith.