您可以使用正则表达式-替换引号之后和非引号字符之后以及非引号字符和引号之前的所有新行：

const src = `ID   Data   Fruit   Examples
1   August   Apple   "I have an apple. (Ana) 
I give her an apple. (Tomas) 
There are apples (Lisa)"
2   July   Melon   "I have a melon. (Ana) 
I give him a melon. (Tomas) 
There are melons (Lisa)"
3   May   Lemon   "I have a lemon. (Ana) 
I give him a lemon. (Tomas) 
There are lemons (Lisa)"`

$pre.textContent = src.replace(/(?<="[^"]+)\n(?=[^"]+")/g, '');

<pre id="$pre"></pre>

这已经是一个有效的TSV文件-因为换行符是在引号中，换行符成为单个单元格的一部分，它不会开始一个新的行。没有什么说像TSV这样的计算机格式必须好看。但是如果你确实想consolodate，并且你正在使用python，你可以用CSV解析器读取，改变单元格并写：

import csv

with open("test.tsv", newline="") as infile, open("testout.tsv", "w", newline="") as outfile:
    reader = csv.reader(infile, delimiter="\t")
    writer = csv.writer(outfile, delimiter="\t")
    for row in reader:
        row[3] = " ".join(row[3].split())
        writer.writerow(row)

请注意，您丢失了信息-换行符分隔了句子。

这很难回答，你需要包含一些代码，并告诉我们你已经尝试过了。
也就是说，这里有一个如何使用JavaScript实现这一点的示例，假设您已经将该列的文本作为变量。

// 'text' defined like in your example above. 
// With quote marks at the start and end and with line breaks as \n
const text = '"I have an apple. (Ana)\nI give her an apple. (Tomas)\nThere are apples(Lisa)"';

// To replace the linebreaks with a space character using regular expression:
const regexText = text.replace( /\n/g, " ");

// To replace the linebreaks with a space character using split/join
const splitJoinText = text.split("\n").join(" ");