Complex sentence: JR-Maglev, MLX01 (X means "experimental"), is a magnetic levitation train system developed by the Japan Railway Technical Research Institute (association of Japan Railway Group), composed of a maximum 5 cars to run on the Yamanashi Maglev Test Line.
Split into simpler sentences: JR-Maglev is a magnetic levitation train system developed by the Japan Railway Technical Research Institute (association of Japan Railway Group). It's composed of a maximum 5 cars to run on the Yamanashi Maglev Test Line.