听说，我在报纸上看到一篇关于她的新闻，他现在已经是一个有名的作家了
The sentence is incorrect, as 听(hear) and 看(see) represent two different senses, a conjunction is required to link them into one sentence,
- 我听说(了[了1]), "也"在报纸上看到(了[了1])一篇关于她的新闻，他现在已经是一个有名的作家了[了2]. Or
Note that "了" is optional in this case, since the verb phrases "听说" and "看到" indicate the actions are/have been completed already. However, "了" is necessary to mean the action has been completed if you say,
- 我在报纸上看了[了1]一篇关于她的新闻，他现在已经是一个有名的作家了.
A good/clear learning resource for 了1 and 了2 - https://resources.allsetlearning.com/chinese/grammar/Uses_of_%22le%22
To explain it clearer, 了 is for converting a past tense to a complete tense in this case.
我在报纸上看到一篇关于她的新闻 = I read a news about her in a newspaper.
我在报纸上看到了一篇关于她的新闻 = I have read a news about her in a newspaper.
Basically in most cases, when you are putting a 了 after a verb, you are indicating that this action has been finished.
