Alice Munro was an accomplished author. She wrote many short stories, of which 'A Postcard' Begins towards the end of winter where Helen has received a postcard after waiting three months from her partner Clare. The postcard is a strange picture and note. Helen puts the postcard in a box and then proceeds to destroy an old letter from her ex-partner. They take a nap and Helen's friend, Alma enters. She says that Clare got married in Florida. Though in doubt at first, she eventually heads to Clare's house to confront him and his new wife. ConStable Shields intervenes, and under Clare's suggestion agrees to take her. The story is portrayed through the event and a series of flashbacks.
I made some subtle corrections for spelling and punctuation, but I believe some parts could do with some changes.
For example, if this is for a project, the line where you say "The postcard is a strange picture and note" is somewhat plain. "The postcard depicted an strange image of a(n) [insert word here], and had an odd [or perhaps "confusing"] note.
When you then say "They take a nap" it is a bit jarring for the reader as the last person noted is the protagonist's ex-partner.
Also, I think the sentence "...where Helen has received a postcard after waiting three months from her partner Clare." could do with changing.
It doesn't feel quite natural, especially the ending "from Clare". That works when something has been received from someone, but the intervening clause "after waiting three months" disrupts that. If you change it to say "...received a postcard from her partner Clare after waiting three months." it would sound more natural. Sorry for all the suggestions!