Complex sentence: In fact the current structure, like a child's nesting doll contains each of its predecessors as a simple two room ground structure was expanded to four rooms constructed of colombage frames made of local cypress members pegged together using typical French joinery technique.
Split into simpler sentences: In fact the current structure, like a child's nesting doll contains each of its predecessors. This grounded structure was next expanded to four rooms still constructed of colombage frames made of local cypress members pegged together using typical French joinery technique.