Complex sentence: Modern Irish nationalism with democratic aspirations began in the 1790s when Theobald Wolfe Tone founded the Society of the United Irishmen, and wanted to end discrimination against Catholics and Presbyterians, in line with Grattan, and then to found an independent Irish Republic.
Split into simpler sentences: Modern Irish nationalism with democratic aspirations began in the 1790s with the founding of the Society of the United Irishmen. It sought to end discrimination against Catholics and Presbyterians and to found an independent Irish republic.