Complex sentence: ENGLISH did not fully allow manipulation of the 3-dimensional multivalued structure of data records, nor did it directly provide common relational capabilities such as joins because powerful data dictionary redefinitions for a field allowed joins via the execution of a calculated lookup in another file.
Split into simpler sentences: ENGLISH did not fully allow manipulation of the 3-dimensional multivalued structure of data records. This was because powerful data dictionary redefinitions for a field allowed joins via the execution of a calculated lookup in another file.