Complex sentence: In January 1642, fearing for the safety of his family and retinue, King Charles left the London area for the north of the country, and was a guest of Sir Arthur Ingram in his York House for some part of this period.
Split into simpler sentences: In January 1642, fearing for the safety of his family and retinue, Charles left the London area for the north of the country. He was a guest of Sir Arthur Ingram in his York House for some of this period.