Complex sentence: Devon Tower was originally planned to be 54 stories and tall, however subsequent space planning revisions--including a decision to locate the data center to a separate facility for security reasons--resulted in a reduced height of, including 50 stories.
Split into simpler sentences: Devon Tower was originally planned to be 54 stories and tall. However, subsequent space planning revisions--including a decision to locate the data center to a separate facility for security reasons--resulted in a reduced height of, including 50 stories.