Complex sentence: Communication about sizes smaller than a 64th of an inch was subjective and hampered by a degree of ineffability-while phrases such as "scant 64th" were used, their communicative ability was limited by subjectivity.
Split into simpler sentences: Communication about sizes smaller than a 64th was subjective and hampered by a degree of ineffability. Phrases such as "scant 64th" were used, but their communicative ability was limited by subjectivity.