Because he wanted to improved his skills, he practiced playing the guitar everyday.

/ Because of wanted to improved his skills, he practiced playing the guitar everyday.

$→$ Because $+$ S $+$ V, S $+$ V

        Because of $+$ V, S $+$ V

$-$ Vì anh ấy muốn cải thiện kĩ năng, anh ấy học đàn guitar hằng ngày.

$\color{#00FFFF}{\text{#}}$$\color{#CCFF99}{\text{A}}$$\color{#99FF99}{\text{ꮮ}}$$\color{#33FF99}{\text{ꮖ}}$$\color{#00FF99}{\text{ꮑ}}$$\color{#99FFCC}{\text{ꭺ}}$$\color{#66FFCC}{\text{ꭺ}}$$\color{#00FF33}{\text{ꭺ}}$$\color{#00FFCC}{\text{ꭺ}}$$\color{#00FFFF}{\text{ꭺ}}$

Đáp án: Because he wanted to improve his skills, he practiced playing the guitar every day. (sửa đề: improved --> improve--> want to  +V1; muốn)

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Because + clause, clause: bởi vì 

Clause: S + V+ O (mệnh đề)