Definition: Rewrite each original sentence in order to make it easier to understand by non-native speakers of English. You can do so by replacing complex words with simpler synonyms (i.e. paraphrasing), deleting unimportant information (i.e. compression), and/or splitting a long complex sentence into several simpler ones. The final simplified sentences need to be grammatical, fluent, and retain the main ideas of their original counterparts without altering their meanings.
Input: 1979 to 1999 The Jubilee line of 1979 was to be the first of four phases of the project, but lack of funds meant that no further progress was made until the late 1990s.

The Jubilee line of 1979 was to be the first of four phases. Not enough money meant that no further progress was made until the late 1990s.