Complex sentence: Saint Francis of Assisi is credited with creating the first live nativity scene in 1223, intending thereby to cultivate the worship of Christ, having been inspired by his recent visit to the Holy Land where he had been shown Jesus's traditional birthplace.
Split into simpler sentences: Saint Francis of Assisi is credited with creating the first live nativity scene in 1223 in order to cultivate the worship of Christ. He himself had recently been inspired by his visit to the Holy Land, where he'd been shown Jesus's traditional birthplace.