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: After Napier initially gained military control of the region by forcing an agreement with the Sindh Amirs, his forces attacked the fortress at Imamgarh.

After Napier captured the region by forcing an agreement with the Sindh Amirs, his forces attacked the fortress at Imamgarh.