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.

However, Twofish has seen less widespread usage than Blowfish, which has been available for a longer period of time.
Twofish has been available for longer, but seen less widespread use than Blowfish.

Iridophores are plates of chitin or protein, which can reflect the environment around a cuttlefish.
Iridophores can reflect a cuttlefish's environment. They are plates of chitin or protein.

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

Napier initially gained military control of the region. He forced an agreement with the Sindh Amirs. His forces attacked the fortress at Imamgarh after.

