Complex sentence: This was complete by 1907 when the new 27cm series 62000 was begun, also with piano accompaniment, and from late 1907 ran in tandem with the 27cm 92000 series with orchestral accompaniments.
Split into simpler sentences: This was complete by 1907 when the new 27cm series 62000 was begun, also with piano accompaniment. From late 1907 it ran in tandem with the 27cm 92000 series, which had orchestral accompaniments.