Simplify the following text for a Grade 15 native English-speaking person.
Original: He joined the International Workingmen 's Association and was charged to go back to Italy and conquer it to Marxâ s ideology , where instead there was the strong influence of the Anarchism of Mikhail Bakunin and the Republicanism of Giuseppe Mazzini .
Simplified: He joined the International Workingmen 's Association and was charged to conquer Italy to Marxâ s ideology , in a country then under the strong influence of the Anarchism of Mikhail Bakunin and the Republicanism of Giuseppe Mazzini .