big files

[thomas615]

Are these sentences OK?

My boss has given me 100 files and 50 of them are big files as each of them contain lots of accounting documents.

[HanibalII]

Are these sentences OK?

My boss has given me 100 files and 50 of them are big files as each of them contain lots of accounting documents.

'My boss has given me 100 files out of which 50 are large, as each of them contain many accounting documents.'

My recommendation.

I feel it has a better natural flow.

[emsr2d2]

I would be inclined to separate it into two sentences.

My boss has given me 100 files. 50 of them are big because they contain a lot of accounts documents.