Complex sentence: AP Films was approached by Roberta Leigh to produce animated programmes for TV, a collaboration that resulted in "The Adventures of Twizzle" and "Torchy the Battery Boy" towards the end of the 1950s.
Split into simpler sentences: AP Films was approached by Roberta Leigh to produce animated programmes for TV. This collaboration resulted in the production of "The Adventures of Twizzle" and "Torchy the Battery Boy" towards the end of the 1950s.