Complex sentence: She worked for 15 years, five years with research assistants, to develop a searchable database on the 100,000 slaves described in documents, including Africans transported to Louisiana in the 18th and 19th centuries.
Split into simpler sentences: She worked for 15 years, five years with research assistants, to develop a searchable database on the 100,000 slaves described in documents. These included Africans transported to Louisiana in the 18th and 19th centuries.