Complex sentence: A contract was signed on 13 October 1998 for an initial six units, with the GNG as the major sub-contractor, and the Hamburg-based Blohm + Voss will build the first two ships, while PSC-ND will complete the final fitting out and trials.
Split into simpler sentences: A contract was signed on 13 October 1998 for an initial six units, with the GNG as the major sub-contractor. Member of the GNG, the Hamburg-based Blohm + Voss was to built the first two ships, while the PSC-ND was to complete the final fitting out and trials.