Complex sentence: More testing with a more advanced pre-production version, unveiled at the 64th IAA Commercial Vehicle International Motor Show in Hanover, took place in Singapore, the UK, the U.S. and Brazil.
Split into simpler sentences: More testing with a more advanced pre-production version unveiled at the 64th IAA Commercial Vehicle International Motor Show in Hanover. Field testing with this version took place in Singapore, the UK, the U.S. and Brazil.