Complex sentence: I Battalion, Reserve Infantry Regiment 91 was moved south from Gommecourt, to join a counter-attack from Bazentin Wood, with two companies advancing on an front; half way to Mametz Wood a "hail" of British small-arms fire stopped the advance.
Split into simpler sentences: I Battalion, Reserve Infantry Regiment 91 was moved south from Gommecourt, to join a counter-attack from Bazentin Wood, with two companies advancing on an front. Half way to Mametz Wood a "hail" of British small-arms fire stopped the advance.