Complex sentence: The spoken word on "Liberation" is an excerpt from "The Diary of Anne Frank", spoken by Mike Oldfield's daughter, Greta, who at the time of recording was roughly the same age as Anne Frank at the time of writing her diary.
Split into simpler sentences: The spoken word on "Liberation" is an excerpt from "The Diary of Anne Frank", spoken by Mike Oldfield's daughter, Greta. Greta Hegerland-Oldfield was at the time of recording roughly the same age as Anne Frank at the time of writing her diary.