Complex sentence: She has a sister named Heather, who goes by the nickname Hedy, who has been featured on her YouTube channel several times, and has her own channel, called ItsJustHedy and has achieved an avid Twitter, YouTube and Instagram following.
Split into simpler sentences: She has a sister named Heather, who goes by the nickname Hedy. Hedy has been featured on her YouTube channel several times, and has her own channel, called ItsJustHedy and has achieved an avid Twitter, YouTube and Instagram following.