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Some commentaries about my proposition :

- "Ont été plus facile à comprendre" : in french, we don't say "l'école est simple". We speak about the lessons. Furthermore, "simple" has several meaning : "les cours sont trop simples pour moi" = "the lessons are too simple/easy for me" it's negative . " j'aime ce cours, il n'est pas compliqué à comprendre, il est simple" = " I like this lesson, it is not too complicate/hard for me, it's easy". It's positive. In your sentence, we cannot decide whether or not it's a good thing. So I rather write " ils ont été (passé composé) faciles à comprendre" (easy to anderstand).

- ces deux cours : in order to avoid the repetition of "matin", I used "ces" which mean "thoses", in this case calculation and chemistry lessons (as you said before).

- repas : means "meal" in order to avoid the repetition of "déjeuner" (French hate repetition. A traduction of "I dreamed a dream" in french is impossible).

- Mon prochain cours est la biologie où nous apprendrons la théorie de l'évolution : If you say that, you say you do not know what the evolution theory is, and the lesson will explain it to you. It's the reason why i have proposed a second sentence with "qui portera sur la théorie de l'évolution "wich will be about...." : it's a way to say the lesson will teach you SOMETHING about evolution theory, but not what the theory is.

- Un bloc de rechange : I don't anderstand what it is... paper ? What do you mean by "j'ai eu un bloc de rechange" ? Did you buy it ? Was it in you bag all along ?

I hope I have helped you. I didn't know your level in french so I tried to explain  my choice in english... Did you anderstand me ?

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