Complex sentence: Pacific Aerospace took over NZAI's work on a replacement for the Fletcher, which became the PAC Cresco and has in turn developed this producing utility and skydiving variants, and then an all-new utility aircraft, the PAC 750XL, which first flew in 2001.
Split into simpler sentences: Pacific Aerospace took over NZAI's work on a replacement for the Fletcher, which became the PAC Cresco and has in turn developed this into utility and skydiving variants. A new utility aircraft, the PAC 750XL, first flew in 2001.