Complex sentence: The project of translating the Bible into Old English gradually ended with the change from Old English to Middle English began (though evidence is very scanty), and eventually there were attempts to provide Bible translations in that language.
Split into simpler sentences: The project of translating the Bible into Old English gradually ended after that process began. A period of change from Old English to Middle English began (though evidence is very scanty), and eventually there were attempts to provide Bible translations in that language.