这句话看不懂I've been doing rather well though,been keeping busy w

这其实是个省略句,完整的是 I've been doing rather well though,I've been keeping busy with summer and the nice weather,
因为两个分句的主语相同,所以可以省略掉第二个I've
意思是“虽然我已经做得很不错了,但是夏天和天气好的时候,我还是会很忙”