Complex sentence: However, the Lancastrians instead made a rapid move north by night, passing within of Edward's army, and by the morning of 2 May, they had gained the safety of Berkeley Castle and had a head start of over Edward.
Split into simpler sentences: However, the Lancastrians instead made a swift move north by night, passing within of Edward's army. By the morning of 2 May, they had gained the safety of Berkeley Castle and had a head start of over Edward.