Complex sentence: The size of a single strand is comparable to a long, silver strand of yarn yet while feeding, Thread grows visibly, being described as a "heavy hawser" rope or "wriggling sausages" about 10 cm by 3 meters in size.
Split into simpler sentences: The size of a single strand is initially comparable to a long, silver strand of yarn. However, while feeding, Thread grows visibly, being described as a "heavy hawser" rope or "wriggling sausages" about 10 cm by 3 meters in size.