Complex sentence: General Samuel Spear of the Fenians managed to escape arrest, and, on June 7, Spear and his 1000 men marched into Canadian territory, achieving occupancy of Pigeon Hill, Frelighsburg, St. Armand and Stanbridge.
Split into simpler sentences: General Samuel Spear of the Fenians managed to escape arrest. On June 7 Spear and his 1000 men marched into Canadian territory, achieving occupancy of Pigeon Hill, Frelighsburg, St. Armand and Stanbridge.