Complex sentence: While on stage, Mercury basked in the love from his audience, Kurt Cobain's suicide note makes a mention of how he both admired and envied Mercury's ability to be so strongly affected by his audience before a performance.
Split into simpler sentences: While on stage, Mercury basked in the love from the audience. This was famously mentioned in Kurt Cobain's suicide note, Cobain writing of how he both admired and envied Mercury's ability to be so strongly affected by his audience before a performance.