Complex sentence: Born into a powerful family, Robert de Sablé was immersed from birth into nobility, though events during de Sablé's life are difficult to pin down; at some point he became lord and ruler of Briollay, France.
Split into simpler sentences: Born into a powerful family, Robert de Sablé was immersed into nobility. Though events during de Sablé's life are difficult to pin down; at some point he became lord and ruler of Briollay, France.