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Lo scienziato lavorava molto e ha inventato una medicina.

Lo scienziato lavorava molto e ha inventato una medicina.
The scientist was working a lot and invented a medicine.
From Lesson 109:Choosing between past tenses·Italian

Questions & Answers about Lo scienziato lavorava molto e ha inventato una medicina.

Why do we use two different past tenses in this sentence?
This sentence perfectly shows the difference between the two past tenses. Lavorava is in the imperfetto because it describes an ongoing background activity (was working). Ha inventato is in the passato prossimo because it was a specific, completed event (invented) that happened during that background time.
Could we say ha lavorato instead of lavorava?
You could, but it changes the story slightly. Saying ha lavorato molto makes it a completed, closed event: he worked a lot, and then he invented it. Using lavorava makes the hard work an ongoing, continuous state in the background of the invention.
Why is the article Lo used for scienziato instead of Il?
Because scienziato starts with an s followed by another consonant (c). In Italian, masculine words starting with s + consonant always take lo instead of il.
Why does molto not change its ending to match anything?
In this sentence, molto is an adverb meaning a lot, and it describes how much he worked. Adverbs never change their endings. If it were describing a noun (like many medicines - molte medicine), it would be an adjective and would have to match the noun's gender and number.

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