Complex sentence: In the autumn of 2010 Belén posed for the "TIM" glamour calendar for the year 2011; after January 2011, because of her position has host of the 61st Festival of Sanremo, Belén ended her participation in the calendars.
Split into simpler sentences: In the autumn of 2010 Belén posed for the "TIM" glamour calendar for the year 2011. After January 2011, because of her position has host of the 61st Festival of Sanremo, Belén ended her participation in the calendars.