Complex sentence: Investigating the area, he unearthed a horde which included a reclining Buddha statue and set out to build a great temple in honour of the image which he believed had been revealed by divine favour.
Split into simpler sentences: Investigating the area, he unearthed a horde which included a reclining Buddha statue. He then set out to build a great temple in honour of the image which he believed had been revealed by divine favour.