Complex sentence: They made their hard left at Senarpont, then a bend at Bourdon toward Doullens, then a hard right toward Albert, and then a final hard right at Albert to place them on course along the long, straight Albert-Amiens road to the target.
Split into simpler sentences: They made their hard left at Senarpont, then a bend at Bourdon toward Doullens. Reaching it they made a hard right toward Albert, and at Albert they made a final hard right to place them on course over the long, straight Albert-Amiens road to the target.