Complex sentence: Also, although Barrett had occasional seasons in London he acted chiefly in the provinces, and so the company was indeed of the most successful ones during this decade, for instance with £2,000 average yearly profits just from the Grand Theatre Leeds.
Split into simpler sentences: Also, although Barrett had occasional seasons in London he acted chiefly in the provinces. The company was indeed of the most successful ones during this decade, for instance with £2,000 average yearly profits just from the Grand Theatre Leeds.