Complex sentence: As with other tribes, the Spokanes suffered from introduced diseases (including smallpox, syphilis, influenza) and land-grabbing brought by white settlers and exacerbated by lack of legal controls to prevent injustice.
Split into simpler sentences: As with other tribes, the Spokanes suffered from introduced diseases, including smallpox. Land-grabbing by white settlers was exacerbated by a lack of legal controls to prevent injustice.