N2
と考えられる
とかんがえられる
Can be considered as, Is thought to be, One can think that, It is conceivable that
日本語は文字種が多いことから、第二言語として習うのが難しいと考えられる。
It is thought that Japanese is difficult to learn as a second language due to having several different character types.
Explanation
Means 'it can be considered that ...', common in papers, research reports and editorials. When writing about the causes or conclusions of research, data, surveys or history, the writer avoids a personal 「と思う」 and uses 「と考えられる」, which sounds objective: given this evidence, anyone would reach the same conclusion. The polite form is 「と考えられます」.
Mixed up with
「と考えられる」: a conclusion reached by reasoning and data, with grounds.
「と思われる」: closer to intuition, a natural feeling or impression; more emotional.
「と見られる」: a guess made from outward signs or public opinion; common in news, weather and markets: 「事故の原因はスピードの出し過ぎと見られる」 (The cause of the accident is thought to be speeding).