そのうえ・しかも
moreover, on top of that, what's more
Sentence。そのうえ / しかも、Sentence。
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そのうえ and しかも add a further point in the same direction, often a stronger one: このホテルは安い。そのうえ、朝ご飯もついている, "this hotel is cheap. On top of that, breakfast is included".
They're the written, slightly formal relatives of それに (N4). しかも often adds something surprising: 頭がいい。しかも、スポーツも得意だ, "he's clever. And what's more, he's good at sports".
しかも can also join within a sentence: 歌が上手で、しかも作曲もできる.
The second point is usually marked with も. Compare ところが, which turns against the first point; そのうえ piles on. Both usually add points of the same kind: good plus good, or bad plus bad.
Examples
このホテルは安い。そのうえ、朝ご飯もついている。
This hotel is cheap. On top of that, breakfast is included.
道に迷った。そのうえ、雨も降ってきた。
I got lost. On top of that, it started raining.
彼は頭がいい。しかも、スポーツも得意だ。
He's clever. And what's more, he's good at sports.
この仕事は給料が安い。しかも、休みも少ない。
This job pays badly. What's more, there's hardly any time off.
彼女は歌が上手で、しかも作曲もできる。
She's a great singer, and she can compose music too.