Complex sentence: These shared interests often give alliances a distinct persona which they use in their role playing (which constitutes the "in character" side of the game), and Nordreich had a persona of imperial Germanic nationalism similar to that held by imperial and Nazi Germany.
Split into simpler sentences: These shared interests often give alliances a distinct persona which they use in their role playing (which constitutes the "in character" side of the game). This alliance has a persona of radical nationalism similar to that held by imperial and Nazi Germany.