The whole sentence means "Sorry for the late reply." It's typical to use the ～て form of a verb followed by ごめなさい to say something like, "Sorry for..." or "Sorry I did..."
2. オランダはサッカーが強いですね。
オランダ - Holland
サッカー - Soccer/Football
強い - Strong
This sentence means "Holland soccer is strong (skilled), isn't it?"
This may translate to being that Soccer teams/players in Holland are generally strong or that perhaps a particular Holland team in a tournament is strong, it just depends on the context.
強い in general seems to be a word to describe skilled athletes or teams in Japan, whereas in English it's more typical to say a particular player or team is "good" or "great."