From what I looked up and understood, it means "Writing in a clear and concise
manner is difficult, isn't it?"

> 分かりやすく簡潔に書くのは難しいですよね

But I thought to connect i-adjectives くて was needed, and 書く should be used
with the を particle not に. If I were to guess に is because its not describing
a person?
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2020-09-12T09:31:53.377
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question
grammar syntax particle-に i-adjectives
分かりやすく簡潔に書くのは難しいですよね
> 分かりやすく簡潔に書くのは難しいですよね  
>  Writing simply and concisely is difficult, isn't it?

Both 分かりやすく and 簡潔に are acting adverbially to modify 書く.

Let's start with why you wouldn't use を here. を marks the object of the verb,
i.e. it marks the thing that actually gets written, for example, a letter, a
poem etc. It doesn't make sense to 'write a brevity' so を is not the correct
particle.

簡潔 is a na-adjective. These words can be turned into adverbs by adding に. So
簡潔に書く means 'write concisely'.

やすい is an i-adjective. These words can be turned into adverbs by replacing い
with く. So 分かりやすく書く means 'write in a way that is easy to understand'.

Finally,

> If I were to guess に is because its not describing a person

Sorry, but I don't know what you mean by this statement. I can't see any link
between using に or を and whether or not you're describing a person. If this is
a problem then perhaps you could ask a separate question, giving an example of
what you mean.
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2020-09-12T09:59:57.057
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2020-09-12T10:10:51.233
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answer