The meaning of this sentence is very unclear to me: そして 真剣に 英語 の 勉強 を し はじめ ました could someone explain pleae?

The meaning of this sentence is very unclear to me:

そして 真剣に 英語 の 勉強 を し はじめ ました

could someone explain pleae?

そして: And then
真剣に: Seriously
英語の勉強: English studies
をしはじめました: Started to do

And then we got:

And then, I started to do my studies (to study is better) of English on a serious way (seriously).