請幫忙修改英文 文法!!!~ The new MTR station will use the new system many old machine will change new model?

如果你是指前後所指的對象相同時，應加個連接詞，表明不同事情。並非把兩個動詞放在一句話內，不符合文法。
The new MRT station will use/utilize the new system. In addition, many old machines will be changed into new models.

或者 The new MRT station will use/utilize the new system, and many old machines will be changed into new models.

另外，
machine(N.)機械;機器;甚至是其他意思 均為可數名詞需加複數s
model (N.) 模型;典範;樣式 也均為可數名詞
然後"通常"不是生命個體所做的行為都應該要用被動來表示，也有例外！

如果你是指前後所指的對象不相同時，應該選擇拆開或者是加個連接詞。
The new MRT station will use/utilize the new system.
Many old machines in other old stations will be changed into new models

The new MRT station will use/utilize the new system. In addition, many old machines in other old stations will be changed into new models

The new MRT station will use a new system.
在與其它的捷運站及所使用的系統做比較，才會有「新」與「舊」之分。但一個新的站裡怎麼會有舊的機器要換新呢？你的句意好像有問題？此外，句構也不正確（將兩個不相干的句子堆疊在一起，卻沒有適當的連接關係）。

Many old machines will be changed into new ones.

Error and Corrections on Grammar:-eg:-
which is declared=will be declared;
Instead of using the old machine model,
the new MTR station
will declare the use of new ones.
will declare=will be declared.
declare=If you declare that something MTR states officially,formally that it exists new system in the case, then you declare for something new in favour of them new.

the mtr station will be run by new system

The new MTR station will use the new system.So the old machine will disable.

Instead of using the old machine model, the new MTR station will use the new system

All will be changed into new ones, including the systems of MRT stations and the models of the machines.

請參考：

Many old machines of MRT station will be changed into the new models.

許多捷運站的舊機器將改為新型號。

【 MRT station 】：捷運站