Complex sentence: The school was originally housed what was once the residence of Dr. Butler in Franklin Street, then in 1891 a new purpose-built building on Grote Street was completed, enabling the number of students to be raised from 100 to 140.
Split into simpler sentences: The school was originally housed in what was previously the residence of Dr. Butler in Franklin Street. In 1891 a new purpose-built building on Grote Street was completed, enabling the number of students to be raised from 100 to 140.