YOU SAID:

The use of compound subjects, compound verbs, prepositional phrases and other elements help lengthen simple sentences, compound subjects and compound verbs explanationbut simple sentences often are short.

INTO JAPANESE

複合主語、複合動詞、前置詞句などの要素を使用すると、単文を長くすることができますが、単文は短い場合が多いです。

BACK INTO ENGLISH

Simple sentences can be made longer by using elements such as compound subjects, compound verbs, and prepositional phrases, but simple sentences are often short.

INTO JAPANESE

単文は、複合主語、複合動詞、前置詞句などの要素を使用することで長くすることができますが、単文は短い場合が多いです。