It's a mild winter this year, isn't it. Nice and easy to get through.
Literal
This-year [topic-は] warm-winter [confirmation-ね]. Easy-to-spend [and-て] good [casual-や].
暖冬 is a standard compound 暖 'warm' + 冬 'winter,' used in everyday weather chat. すごしやすい is 過ごす 'to spend time' + やすい 'easy to,' describing the winter as comfortable. The final や is a casual sentence-ender conveying mild satisfaction — more relaxed than いいわ or いいな. Two short sentences in casual feminine speech.