Complex sentence: In the first months of 1640, now twenty-three years old, he decided to return to his parents at Calanda, and after about one week's travel he arrived during the second week of Lent, i.e. between March 11-14.
Split into simpler sentences: In the first months of 1640, now 23 years old, he decided to return to his parents at Calanda. After about one week's travel he arrived during the second week of Lent, i.e. between March 11-14.