Complex sentence: Revamped by Adlon, the place started serving famous international treats, highlighting the "Bouillabaisse" specialty; daily yielding 6,000 daily goldmarks, the it once hosted William II, whose ensuing friendship meant Adlon's definitive belonging into the German high society.
Split into simpler sentences: Revamped by Adlon, the place started serving famous international treats, highlighting the "Bouillabaisse" specialty, and the business yielded 6,000 daily goldmarks. Furthermore, it once hosted William II, whose ensuing friendship meant Adlon's definitive belonging into the German high society.