Complex sentence: Cornplanter was half-brother to Handsome Lake, a Seneca religious leader of the Iroquois, and uncle to Governor Blacksnake, a Seneca warchief who, like Cornplanter, had an exceptionally long life for a man of his times.
Split into simpler sentences: Cornplanter was half-brother to Handsome Lake, a Seneca religious leader of the Iroquois. He was uncle to Governor Blacksnake, a Seneca war chief who, like Cornplanter, had an exceptionally long life for a man of his times.