Complex sentence: When his uncle Guillaume Louis Baud died Couperus went back to The Hague to attend the funeral and here Couperus decided to marry his cousin Elisabeth Couperus-Baud.
Split into simpler sentences: When his uncle Guillaume Louis Baud died Couperus went back to The Hague to attend the funeral. Here Couperus decided to marry his cousin Elisabeth Couperus-Baud.