〜も〜ば〜も
both … and; some … and some
Noun も + ば-form、Noun も + Verb
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も〜ば〜も lists two things that are both true: 彼はお金もあれば、時間もある, "he has both money and time".
Each item takes も, and the first verb goes into the ば-form, often the same verb repeated: あれば…ある, いれば…いる.
It also describes variety: 人生にはいい時もあれば、悪い時もある, "in life there are good times and bad times"; 賛成する人もいれば、反対する人もいる, "some people are for it, and some against".
It's similar to し (N4) and to て-form lists, but more balanced and rhythmic. In grammar questions, spotting the first も is the clue that a ば-form is coming.
Examples
彼はお金もあれば、時間もある。
He has both money and time.
人生にはいい時もあれば、悪い時もある。
In life, there are good times and bad times.
彼女は歌も歌えば、ピアノも弾く。
She sings, and she plays the piano too.
この町は海もあれば、山もある。
This town has both the sea and the mountains.
賛成する人もいれば、反対する人もいる。
Some people are for it, and some are against.