Complex sentence: Forstmann founded Forstmann-Leff Associates in 1967 with Joel Leff and was an original investor in Forstmann Little & Company in 1975 with his two brothers, Theodore J Forstmann (Ted) and Nicholas C Forstmann (Nick).
Split into simpler sentences: Forstmann founded Forstmann-Leff Associates in 1967 with Joel Leff. Forstmann was an original investor in in 1975 with his two brothers, Theodore J Forstmann (Ted) and Nicholas C Forstmann (Nick).