Here are the suggested completions for each sentence:
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Because of his accomplishments, he is often referred to as the founder of Egyptology.
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Because Champollion gathered a lot of material during his trip to Egypt, he was able to make significant progress in understanding hieroglyphics.
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Because Champollion died before he could finish his dictionary, his work was left incomplete, and later scholars had to continue it.
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Because of Champollion's deciphering methods, language barriers in understanding ancient Egyptian texts were eventually broken.
If you need to make any adjustments for context or specific wording, feel free to let me know!