original: Elin arrives at Agnes's house, mainly as an excuse to avoid going to a different party, where there will be a boy (Johan) (Mathias Rust) she wants to avoid.
simplifications: Elin arrives at Agnes's house, in order to avoid going to a different party, where there will be a boy she wants to avoid. Elin arrives at Agnes's house to avoid party where is Johan. Elin arrives at Agnes's house. She uses it as an excuse. She wishes to avoid a boy. Elin goes to Agnes's house to avoid going to a different party, where there will be a boy (Johan) (Mathias Rust) she wants to avoid. Elin arrives at Agnes's house. It is an excuse to avoid going to a different party. There is  boy there she wants to avoid (Johan) (Mathias Rust). Elin wants to avoid a boy so she goes to Agnes's house. Elin arrives at Agnes's house. She came here as an excuse to avoid a boy at a different party. Elin goes to Agnes's house to avoid going to another party where there is a boy (Johan) (Mathias Rust) that she doesn't want to see. Elin wanted to avoid Johan so she went to Agnes's house. Elin arrives at Agnes ' house, mainly as an excuse to avoid going to another party, where there's going to be a boy (Johan) (Mathias Rust) she wants to avoid.