Complex sentence: It opened in 1959 as an office building before owner Miles Fiterman, whom the building was named after, donated it to BMCC in 1993, which at the time was the largest private donation to a community college in U.S. history.
Split into simpler sentences: It opened in 1959 as an office building before owner Miles Fiterman, whom the building was named after, donated it to BMCC in 1993. At the time it was the largest private donation to a community college in U.S. history.