Complex sentence: Meanwhile, two companies of the 2/16th were ordered to support an attack on Jebel Ekteif by the 2/15th London Regiment and by 08:15 they had captured the advanced trenches, three companies then fought their way up into the firing line on the summit of the hill.
Split into simpler sentences: Meanwhile, two companies of the 2/16th were ordered to support an attack on Jebel Ekteif by the 2/15th London Regiment. By 08:15 they had captured the advanced trenches, three companies, and fought their way up into the firing line on the summit of the hill.