Complex sentence: Shipments to Croatia began in 1991, to do this President Menem signed two secret decrees, endorsed by several ministers, and continued from 1993 until 1995, when Menem affixed his signature to a third secret decree for the same purpose.
Split into simpler sentences: Shipments to Croatia began in 1991, when President Menem signed two secret decrees, endorsed by several ministers. These continued from 1993 until 1995, when Menem affixed his signature to a third secret decree for the same purpose.