Complex sentence: When he woke the following morning, he had a tune in his head which he assumed was from the soundtrack, but he soon realised with wasn't so he wrote down the basic structure of the song Bono On Bono-Conversations With Michka Assayas.
Split into simpler sentences: When he woke the following morning, he had a tune in his head which he assumed was from the soundtrack. He soon realised it wasn't so he wrote down the basic structure of the song Bono On Bono-Conversations With Michka Assayas.