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: The Spanish did not manage to conquer the island until 1697, after several attempts, that begun in 1629, when they marched in, from Corozal in Belize, Yucatán and Alta Verapaz, attacked via boats and destroyed it.

The Spanish couldn't capture the island until 1697, when they marched in, from Corozal in Belize, Yucatán and Alta Verapaz, attacked via boats and destroyed it.