Complex sentence: Robert Estienne did not directly consult this manuscript in his Editio Regia (1550), but since his edition was based on the Erasmian text, 2's readings became a basis for the Textus Receptus.
Split into simpler sentences: Robert Estienne did not use this manuscript in his Editio Regia (1550), but based on Erasmian text. In result its readings became a basis for the Textus Receptus.