Complex sentence: Due to his civil rights activity, al-Jamri was imprisoned between April and September 1995, before being arrested again in January 1996 and imprisoned until July 1999, which was followed by a year and a half of house arrest.
Split into simpler sentences: Due to his civil rights activity, al-Jamri was arrested twice and placed under house arrest for years. The second arrest was in January 1996 and lasted until July 1999 followed by a year and a half of house arrest.