Complex sentence: Members of Hui Aloha ʻĀina collected over 21,000 signatures opposing an annexation treaty while another 17,000 signatures were collected by members of Hui Kālaiʻāina although the latter petitions were not submitted to Congress because they asked for the restoration of the queen.
Split into simpler sentences: Members of Hui Aloha ʻĀina collected over 21,000 signatures opposing an annexation treaty. Another 17,000 signatures were collected by members of Hui Kālaiʻāina but not submitted to Congress because they were asking for the restoration of the queen.