Complex sentence: Additionally, former HCHS graduates who served honorably in the state legislature like Brian Flaherty (R-66, Watertown), eventually resigned his post because of perceived ethical shortcomings and his proximity to Rowland.
Split into simpler sentences: Additionally, former HCHS graduates have served honorably in the state legislature. But some, like Brian Flaherty (R-66, Watertown), eventually had to resigned his post because of perceived ethical shortcomings and his proximity to Rowland.