Complex sentence: At the height of such turmoil, Rachmaninoff received an offer to perform ten piano recitals across the peaceful Scandinavia, which he used as an excuse to quickly obtain permits for his family to leave the country.
Split into simpler sentences: At the height of such turmoil, Rachmaninoff received an offer to perform ten piano recitals across the peaceful Scandinavia. He used this as an excuse to quickly obtain permits for his family to leave the country.