Complex sentence: When he returned to America, she remained in Paris; the couple drew up a separation agreement, which provided Oelrichs with $18,000 a year; a clause in the agreement meant that neither could bring divorce in future on the grounds of adultery.
Split into simpler sentences: When he returned to America, she remained in Paris, and the couple drew up a separation agreement, which provided Oelrichs with $18,000 a year. A clause in the agreement meant that neither could bring divorce in future on the grounds of adultery.