Complex sentence: He commanded the Caucasian Cossack Brigade in the attack of the Green Hills at the second battle of Pleven.infantry division under General Mikhail Skobelev assailed the Grivitsa redoubt to the north.
Split into simpler sentences: He commanded the Caucasian Cossack Brigade in the attack of the Green Hills at the second battle of Pleven. An infantry division under Skobelev's command assailed the Grivitsa redoubt to the north.