Complex sentence: At the time, Guyatone was one of Japan's leading musical instrument manufacturers, however, Guyatone could not meet Aria's production requirements and in 1964 Aria contracted guitar and banjo manufacturing with Matsumoku.
Split into simpler sentences: At the time, Guyatone was one of Japan's leading musical instrument manufacturers, however, Guyatone could not meet Aria's production requirements. In 1964, Aria contracted guitar and banjo manufacturing with Matsumoku.