Complex sentence: It is located in central Athens immediately next to Syntagma Square, on the corner of Karageorgi Servias and Stadiou Streets, and is now part of "The Luxury Collection" hotel chain, owned by the American company Starwood Hotels & Resorts.
Split into simpler sentences: It is located in central Athens immediately next to Syntagma Square, on the corner of Karageorgi Servias and Stadiou Streets. The hotel is now part of "The Luxury Collection" hotel chain, owned by the American company Starwood Hotels & Resorts.