Combining or merging weaker web pages into a single page may improve your SEO ranking. However, as with a lot of SEO advice, there is a caveat.
The pages must be similar or complementary such that when combined, they create one strong page addressing a single subject or topic.
Single pages could also be written on the same topic by different authors. When combined to create a single page with different viewpoints, the added depth can improve the page’s ranking.
The idea is that two pages of lesser ranking can result in a single, higher-ranking page. However, Search Engine Journal warns that merging pages on two different topics or creating a page that is too diffuse can result in a page with a lesser ranking than those that were achieved by the two single pages.
Learn when you should or should not merge pages in “Google Shares How to Rank Better by Combining Pages.”