Complex sentence: Richelieu created other regiments to sustain the effort of French colonization in New France, however first and foremost in the Antilles, the first French colonizers set foot in Guadeloupe and Martinique in the year 1630.
Split into simpler sentences: Richelieu created other regiments to sustain the effort of French colonization in New France. The first supported national efforts in the Antilles; the first French colonizers arrived in the islands of Guadeloupe and Martinique (named by the French) in the year 1630.