Complex sentence: The boron units have a formula of B 5 O 6 (OH) 6 and a charge of -3, and are composed of three borate tetrahedra and two borate triangular groups.
Split into simpler sentences: The boron units have a formula of B 5 O 6 (OH) 6 and a charge of -3. They are composed of three borate tetrahedra and two borate triangular groups.