Complex sentence: During this time Henry was in York on a nationwide tour of the country, as soon as he advanced toward Worcester, in order to eliminate any pro Yorkist support, which could be gained, the Stafford brothers fled into sanctuary.
Split into simpler sentences: During this time Henry was in York on a nationwide tour of the country. As soon as he advanced toward Worcester, in order to eliminate any pro Yorkist support, which could be gained, the Stafford brothers fled into sanctuary.