Happy moments.
It is wrapped in gentle sunlight of spring. In this time, reading a book is happiness.
Happy moments.
It is wrapped in gentle sunlight of spring, the time a book reading this is happiness.
Wrapped in the gentle sunlight of spring, reading a book. This is happiness.
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Such beautiful imagery! I changed it to a more poetic style and natural tone. Another way:
Happiness is the time spent reading a book, wrapped in the gentle sunlight of spring.
Enjoy the sunshine! :)