What it means
ことは〇〇が expresses concession or contrast. It acknowledges that the first statement is true, while the following clause adds a limitation, opposing fact, or different perspective. With verbs and adjectives, the predicate is often repeated before が, as in 見ることは見るが, meaning “I do watch it, but...” The first part is commonly in the plain form even when the overall sentence is polite.
Usage note
Do not confuse this pattern with simple nominalization using こと. The repeated predicate is important because it gives the sentence its concessive meaning. In polite sentences, the first predicate before ことは normally remains plain, while the repeated predicate and the rest of the sentence can be made polite.
How to use it
この部屋は静かなことは静かですが、駅から遠いです。
This room is certainly quiet, but it is far from the station.
この料理は辛いことは辛いですが、子供には食べにくいです。
This dish is certainly spicy, but it is difficult for children to eat.
この映画を見ることは見ますが、毎週は見ません。
I do watch this movie, but I do not watch it every week.
この部屋は静かなことは静かだが、駅から遠い。
This room is certainly quiet, but it is far from the station.
この料理は辛いことは辛いが、子供には食べにくい。
This dish is certainly spicy, but it is difficult for children to eat.
この映画を見ることは見るが、毎週は見ない。
I do watch this movie, but I do not watch it every week.