Complex sentence: Kirksey retrofitted their building to become the first LEED EB (existing building) certified in Texasas well as operating internally as a green company for many years through recycling efforts, green cleaning programs, alternative transportation incentives for employees.
Split into simpler sentences: Kirksey retrofitted their building to become the first LEED EB (existing building) certified in Texas. Additionally, they have been operating internally as a green company for many years through recycling efforts, green cleaning programs, alternative transportation incentives for employees.