Complex sentence: All this he confides to Hilda, a young woman whom he first met as a child ten years before while building a fine new church in her village, who unexpectedly visits Solness at his home after these ten years.
Split into simpler sentences: All this he confides to Hilda, a young woman whom he first met as a child ten years before while building a fine new church in her village. She unexpectedly visits Solness at his home after these ten years.