Complex sentence: Hari Singh Nalwa was the first to cross the Indus at Attock to the Sikh post of Khairabad; he was accompanied by Diwan Kirpa Ram and Khalsa Sher Singh, the Maharaja's teenaged son, besides 8,000 men.
Split into simpler sentences: Hari Singh Nalwa was the first to cross the Indus at Attock to the Sikh post of Khairabad. He was accompanied by Diwan Kirpa Ram and Khalsa Sher Singh, the Maharaja's teenaged son, besides 8,000 men.