Complex sentence: The lengths of the B-H bridge bonds and the B-H terminal bonds are 1.33 and 1.19 Å respectively, and this difference in the lengths of these bonds reflects the difference in their strengths, the B-H bridge bonds being relatively weaker.
Split into simpler sentences: The lengths of the B-H bridge bonds and the B-H terminal bonds are 1.33 and 1.19 Å, respectively. The difference in the lengths of these bonds reflects the difference in their strengths: the B-H bridge bonds are relatively weaker.