Complex sentence: The family settled in Mikawa and served the Matsudaira clan as retainers; later, when the main Matsudaira family became the Tokugawa clan, the Honda had a rise in prestige.
Split into simpler sentences: The family settled in Mikawa and served the Matsudaira clan as retainers. Later, when the main Matsudaira family became the Tokugawa clan, the Honda rose in prestige.