Complex sentence: This technique was well documented on episode 5 of the BBC's "The Life of Birds"! Some black herons feed solitarily, while others feed in groups of up to 50 individuals, 200 being the highest number reported.
Split into simpler sentences: This technique was well documented on episode 5 of the BBC's "The Life of Birds". Some have been observed feeding in solitary, while others feed in groups of up to 50 individuals, 200 being the highest number reported.