Complex sentence: Lawrence was surprised with the impact of the song after watching some YouTube videos We always thought it was a good song and catchy, but we didn't think it would affect pop culture the way that it has.
Split into simpler sentences: Lawrence was surprised at the impact of the song after watching some YouTube videos. He stated that (w) e always thought it was a good song and catchy, but we didn't think it would affect pop culture the way that it has.