Complex sentence: It was soon apparent to Richard and their manager that the audience wanted to see more of Karen and although unwilling, she eventually agreed to sing the ballads standing, but would return to her drums for the lesser known songs.
Split into simpler sentences: It was soon apparent to Richard and their manager that the audience wanted to see more of Karen. Although unwilling, she eventually agreed to sing the ballads standing, but would return to her drums for the lesser known songs.