The agency has promoted former senior project manager Floss Clifford-Loynes to the role of creative lead, while project managers Tom Baines and Katie Ramsden have become account managers.
Simply Better, which has a latest reported turnover of £2.2m, is aiming to grow its turnover to £3m this calendar year.
Simply Better director, Rob Woodhead, said: "Floss, Tom and Katie fully deserve these promotions. Their experience and creativity enables them to fully engage with clients and deliver memorable events that achieve their communication needs."
Earlier this month the Yorkshire-based agency announced that electronics specialist Maplin had re-appointed it to deliver its annual staff conference. Other clients for the agency include Skipton Building Society and Provident Financial.
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