Teacher:In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
Teacher: Now, understand the problem? Solve this instance: After the arrival of the first production 707 in 1957 the Dash 80 was adapted into a general experimental aircraft and used by Boeing to test a variety of new technologies and systems .
Student:
After the first 707 was made in 1957 , the Dash 80 was changed into a test planes for other things .