Complex sentence: Having never truly applied himself in high school, Alan really couldn't write well but fortunately Siegel's fraternity brother at Zeta Beta Tau, Robert Dudnick, recognized he was struggling and needed help.
Split into simpler sentences: Having never truly applied himself in high school, Alan really couldn't write well. Fortunately, Siegel's fraternity brother in Zeta Beta Tau, Robert Dudnick, recognized he was struggling and needed help.