a paragraph have purpose to make an article easy to read. if you write long paragraph, its difficult to read.
just write 3-5 sentences in one paragraph. it is easy and fun. the most important is reader understand the message you try to say. not how long the paragraph you write.
and the last technique is write descriptive paragraph. writing descriptive paragraph is easy. because just explain what you already know. don't try to write about you don't know.
create 3-4 list topic for your article. explain the topic in some paragraph. do it until all topic done.
there is a formula to write descriptive article more easy. the key of formula is located 