Complex sentence: They separated in 1993 and divorced in 1999 after years of litigation during which Liba sought to invalidate a prenuptial agreement she had signed prior to their marriage, claiming duress as she was pregnant at the time.
Split into simpler sentences: They separated in 1993 and divorced in 1999 after years of litigation. Liba had sought to invalidate a prenuptial agreement she had signed prior to their marriage claiming duress as she was pregnant at the time.