Complex sentence: But the inexperienced team could not meet the challenge of the changing times--due to the competition from comics, TV, cable TV, and books with coloured illustrations; the total circulation of children's magazines dropped steadily in this period.
Split into simpler sentences: But the inexperienced team could not meet the challenge of the changing times--due to the competition from comics, TV, cable TV, and books with coloured illustrations. The total circulation of children's magazines dropped steadily in this period.